33,550,336

Number
$33 \, 550 \, 336$ is:


 * $2^{12} \times 8191$


 * The $8191$st triangular number:
 * $33 \, 550 \, 336 = \displaystyle \sum_{k \mathop = 1}^{8191} k = \dfrac {8191 \times \left({8191 + 1}\right)} 2$


 * The $4096$th hexagonal number:
 * $33 \, 550 \, 336 = \displaystyle \sum_{k \mathop = 1}^{4096} \left({4 k - 3}\right) = 4096 \left({2 \times 4096 - 1}\right)$


 * The $5$th perfect number after $6$, $28$, $496$, $8128$:
 * $33 \, 550 \, 336 = \sigma \left({33 \, 550 \, 336}\right) - 33 \, 550 \, 336 = 4096 \times 8191 = 2^{13 - 1} \left({2^{13} - 1}\right)$