41,328

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Number

$41 \, 328$ (forty-one thousand, three hundred and twenty-eight) is:

$2^4 \times 3^2 \times 7 \times 41$

The $144$th hexagonal number:

$41 \, 328 = \ds \sum_{k \mathop = 1}^{144} \paren {4 k - 3} = 144 \paren {2 \times 144 - 1}$

The $287$th triangular number:

$41 \, 328 = \ds \sum_{k \mathop = 1}^{287} k = \dfrac {287 \times \paren {287 + 1} } 2$

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