Sixty

Sixty (60, LX) is a natural number following fifty-nine and preceding sixty-one. It is a composite number with the divisors being 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, making it also a highly composite number. Its factorization is:

This number is the sum of a twin prime (29 + 31), as well as the sum of four consecutive primes (11 + 13 + 17 + 19).

The Babylonian number system had a base of sixty. A number system with base sixty is called a sexagesimal number system.

Sixty is also:

• in time, the seconds in a minute, and the minutes in an hour.
• in geometry, the seconds in a minute, and the minutes in a degree.
• A common speed limit, miles per hour, for freeways in many US states.
• In years of marriage, the diamond wedding anniversary.
• The code for international direct dial calls to Malaysia.
• For the year AD 60, see 60.
• The atomic number of neodymium, a lanthanide.

See also: fifty, sixty, seventy, integer, list of numbers.