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60 (number)

60 (sixty) is the natural number following 59 and preceding 61. Being thrice twenty, 60 is called "three score" in some older literature.

← 60 61 62 63 64 65 66 67 68 69 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	60 sixty
Ordinal	60th sixtieth
Numeral system	sexagesimal
Factorization
Divisors	1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Roman numeral	LX
Roman numeral (Unicode)	LX, lx
Binary	111100
Octal	74
Duodecimal	50
Hexadecimal	3C
Gematria	ס (Samekh)

Contents 1 In mathematics 2 In science 2.1 Astronomy 3 In religion 4 In other fields 5 In music 6 In sports 7 Historical years 8 References

In mathematics

Sixty is a composite number with divisors 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, making it also a highly composite number. Because 60 is the sum of its unitary divisors (excluding itself), it is a unitary perfect number. Being ten times a perfect number, 60 is a semiperfect number.

60 is the smallest number divisible by the numbers 1 to 6. (There is no smaller number divisible by the numbers 1 to 5). 60 is the smallest number with exactly 12 divisors.

This number is the sum of a pair of twin primes (29 + 31), as well as the sum of four consecutive primes (11 + 13 + 17 + 19). It is adjacent to two prime numbers (59,61).

The smallest non-abelian simple group has order 60.

In geometry, 60 is the number of seconds in a minute, and the number of minutes in a degree. In normal space, the 3 interior angles of an equilateral triangle each measure 60 degrees, adding up to 180 degrees.

The Babylonian number system had a base of sixty. The number system in the Mali Empire was apparently also based on sixty (this is reflected in the counting system of the Maasina Fulfulde, a variant of the Fula language spoken in contemporary Mali). A number system with base-sixty is called the sexagesimal (original meaning of sexagesimal is sixtieth).

The sexagenary cycle plays a role in Chinese calendar and numerology.　(Originally, sexagenary means sixty each, also centenary means one hundred each.)

Because 60 is divisible by the sum of its digits in base 10, it is a Harshad number.

In German: das Schock and in Latin: sexagena equals 60 = 5 dozen = 1/2 small gross. This quantity was used in international medieval treaties e.g. for ransom of captured Teutonic Knights.

In science

• The atomic number of neodymium, a lanthanide. The neodymium following element with the ordinal number 61 (promethium) has in contrast to the neighbour elements no stable isotopes.

Astronomy

• Messier object M60, a magnitude 10.5 galaxy in the constellation Virgo
• The New General Catalogue object NGC 60, a spiral galaxy in the constellation Pisces
• The Saros number of the solar eclipse series which began on -1020 May 18 and ended on 260 June 26. The duration of Saros series 60 was 1280.1 years, and it contained 72 solar eclipses. The Saros number of the lunar eclipse series which began on -700 March 8 and ended on 616 May 7. The duration of Saros series 60 was 1316.2 years, and it contained 74 lunar eclipses.

In religion

• Judaism
  • In the laws of kashrut, the proportion (60:1) of kosher to non-kosher ingredients which can render an admixture kosher post-facto. (Talmud, Tractate Chullin 98b ; Shulchan Aruch, Yoreh Deah 98)
  • In the Bedtime Shema, the number of strong men (giborim) said to surround King Solomon's bed.

In other fields

Sixty is:

• In time, the number of seconds in a minute, and the number of minutes in an hour.^[1]
• 60 Minutes, a CBS investigative television show
• Sixty Minute Man was a TV show starring Kenny Baumann
• The number of the European route E60 from Brest, France, to Constanţa, Romania
• A common speed limit, in miles per hour, for freeways in many U.S. states
• A common speed limit, in kilometers per hour, in urban areas in Russia
• In years of marriage, the diamond wedding anniversary
• The maximum number of marbles (game pieces) in Chinese checkers
• The code for international direct dial calls to Malaysia
• The highest obtainable level on World of Warcraft (not including World of Warcraft: The Burning Crusade)
• Studio 60 on the Sunset Strip was a TV show on NBC (2006-07)
• Gone in Sixty Seconds is a movie starring Nicholas Cage
• Miss Sixty is a women's apparel brand
• The total number of cards in the game Racko

In music

• “Sixty Minute Man,” a song by the Dominoes
• "60 Second Song for a Bank, with the Words, May We Help You," a song by John Denver
• "Sixty Years On," a song by Elton John

In sports

• New York Yankees Babe Ruth hit 60 home runs in 1927
• Atlanta Falcons Tommy Nobis uniform #60
• Philadelphia Eagles Chuck Bednarik uniform #60
• NBA: Gilbert Arenas set a Washington Wizards franchise record scoring 60 points on Dec. 17, 2006 (leading the Wizards to a 147-141 win over the Los Angeles Lakers).

Historical years

60 A.D., 60 B.C., 1960, 2060, etc.

References

1. ^ Dennis Guedj, Numbers: The Universal Language, transl. Lory Frankel. New York: Harry N. Abrams, Inc. Publishers (1997): 71. "60: the ace of divisibility. The more divisible a number is ... the more useful it proves in certain situations. ... Is it because 60 is highly divisible that the hour has been divided into 60 minutes, and the minute into 60 seconds? Look at the list of its twelve divisors ... Compare this with the larger number 100, which has only nine divisors."