Thirty
30 is an even number.
30 is a Harshad number, which means it is divisible by the sum of its digits (3 + 0 = 3, and 30 is divisible by 3).
In binary, 30 is represented as 11110.
In hex, 30 is represented as 1e.
Prime factorization of 30: 2 * 3 * 5.