108

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


 * $2^2 \times 3^3$


 * The $22$nd highly abundant number after $1, 2, 3, 4, 6, 8, 10, 12, 16, 18, 20, 24, 30, 36, 42, 48, 60, 72, 84, 90, 96$:
 * $\sigma \left({108}\right) = 280$


 * 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