6816

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Number

$6816$ (six thousand, eight hundred and sixteen) is:

$2^5 \times 3 \times 71$

The $48$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $\ldots$, $5985$, $6256$, $6533$:

$6816 = \ds \sum_{k \mathop = 1}^{48} \paren {6 k - 5} = 48 \paren {3 \times 48 - 2}$

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