9180

Number
$9180$ (nine thousand, one hundred and eighty) is:


 * $2^2 \times 3^3 \times 5 \times 17$


 * The $68$th hexagonal number after $1$, $6$, $15$, $28$, $45$, $66$, $91$, $\ldots$, $6903$, $7140$, $7381$, $7626$, $7875$, $8128$, $8385$, $8646$, $8911$:
 * $9180 = \displaystyle \sum_{k \mathop = 1}^{68} \left({4 k - 3}\right) = 68 \left({2 \times 68 - 1}\right)$