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60 is the natural number following 59 and preceding 61.
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. And because it is divisible by the sum of its digits in base 10, it is a Harshad 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).
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).
The smallest non-abelian simple group has order 60.
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. A number system with base sixty is called a sexagesimal number system.
The Sexigesimal cycle plays a role in Chinese numbering and numerology.
In science
In astronomy,
- Messier object M60, a magnitude 10.5 galaxy in the constellation Virgo
- The New General Catalogue object (http://www.ngcic.org/) NGC 60, a spiral galaxy in the constellation Pisces
- The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) 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 (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) 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 other fields
Sixty is also:
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