9633

Number
$9633$ (nine thousand, six hundred and thirty-three) is:


 * $3 \times 13^2 \times 19$


 * The $57$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $\ldots$, $7701$, $8008$, $8321$, $8640$, $8965$, $9296$:
 * $9633 = \displaystyle \sum_{k \mathop = 1}^{57} \left({6 k - 5}\right) = 57 \left({3 \times 57 - 2}\right)$