108

Number
$108$ (one hundred and eight) is:


 * $2^2 \times 3^3$


 * The $15$th powerful number after $1, 4, 8, 9, 16, 25, 27, 32, 36, 49, 64, 72, 81, 100$


 * The $29$th positive integer which is not the sum of $1$ or more distinct squares:
 * $2, 3, 6, 7, 8, 11, 12, 15, 18, 19, 22, 23, 24, 27, 28, 31, 32, 33, 43, 44, 47, 48, 60, 67, 72, 76, 92, 96, 108, \ldots$


 * The number of distinct heptominoes, up to reflection.

Also see

 * 108 Heptominoes