3600

3600 = 2 x 2 x 2 x 2 x 3 x 3 x 5 x 5.

3600 is a perfect square (A159991). It is both the sum and the difference of two primes (A106575).

3600 has a representation as a sum of two squares: 3600 = 36² + 48².

3600 is the order of a perfect group.

3600 is 11221100 in base 3 (A033001). It is 2100 in base 12 and 1100 in base 15.

3600 is a concentric hexadecagonal number (A195146).

3600 is the number of seconds in an hour.

Source: Number Gossip