660

Number
$660$ (six hundred and sixty) is:


 * $2^2 \times 3 \times 5 \times 11$


 * The $40$th highly abundant number after $1$, $2$, $3$, $4$, $6$, $8$, $10$, $\ldots$, $210$, $216$, $240$, $288$, $300$, $336$, $360$, $420$, $480$, $504$, $600$, $630$:
 * $\map {\sigma_1} {660} = 2016$