3610

Number
$3610$ (three thousand six hundred and ten) is:


 * $2 \times 5 \times 19^2$


 * The $19$th pentagonal pyramidal number after $1, 6, 12, 40, 75, 126, 196, 288, 405, 550, 726, 936, 1183, 1470, 1800, 2176, 2601, 3078$:
 * $3610 = \displaystyle \sum_{k \mathop = 1}^{19} \dfrac {k \left({3 k - 1}\right)} 2 = \dfrac {19^2 \left({19 + 1}\right)} 2$