Fifty four
54 is an even number.
54 is a Harshad number, which means it is divisible by the sum of its digits (5 + 4 = 9, and 54 is divisible by 9).
In binary, 54 is represented as 110110.
In hex, 54 is represented as 36.
Prime factorization of 54: 2 * 33.