616

Number
$616$ (six hundred and sixteen) is:
 * $2^3 \times 7 \times 11$


 * The $16$th heptagonal number after $1, 7, 18, 34, 55, 81, 112, 148, 189, 235, 286, 342, 403, 469, 540$:
 * $616 = \displaystyle \sum_{k \mathop = 1}^{16} \left({5 k - 4}\right) = \dfrac {16 \left({5 \times 16 - 3}\right)} 2$


 * The $19$th integer $n$ after $1$, $3$, $15$, $30$, $35$, $56$, $70$, $78$, $105$, $140$, $168$, $190$, $210$, $248$, $264$, $357$, $420$, $570$ with the property that $\tau \left({n}\right) \mathrel \backslash \phi \left({n}\right) \mathrel \backslash \sigma\left({n}\right)$:
 * $\tau \left({616}\right) = 16$, $\phi \left({616}\right) = 240$, $\sigma \left({616}\right) = 1440$