1080

Number
$1080$ (one thousand and eighty) is:


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


 * The $27$th pentagonal number after $1$, $5$, $12$, $22$, $35$, $\ldots$, $477$, $532$, $590$, $651$, $715$, $782$, $852$, $925$, $1001$:
 * $1080 = \displaystyle \sum_{k \mathop = 1}^{27} \left({3 k - 2}\right) = \dfrac {27 \left({3 \times 27 - 1}\right)} 2$