60

60 = 2² x 3 x 5.

60 is the smallest number with six representations as a sum of two primes: 60 = 7 + 53 = 13 + 47 = 17 + 43 = 19 + 41 = 23 + 27 = 29 + 31.

60 is a number that cannot be written as a sum of three squares.

60 is 66 ion base 9.

60 is the least common multiple of the first five positive integers.

There are 60 seconds in one minute and 60 minutes in one hour.

Source: Phillips, R. 2004. Numbers: Facts, Figures and Fiction. Badsey Publications.