624

Number
$624$ (six hundred and twenty-four) is:
 * $2^4 \times 3 \times 13$


 * The $20$th trimorphic number after $1$, $4$, $5$, $6$, $9$, $24$, $25$, $49$, $51$, $75$, $76$, $99$, $125$, $249$, $251$, $375$, $376$, $499$, $501$:
 * $624^3 = 242 \, 970 \, \mathbf {624}$


 * The $50$th untouchable number after $2, 5, 52, 88, 96, 120, 124, \ldots, 530, 540, 552, 556, 562, 576, 584, 612$.