7714

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Number

$7714$ (seven thousand, seven hundred and fourteen) is:

$2 \times 7 \times 19 \times 29$

The $28$th square pyramidal number after $1$, $5$, $14$, $30$, $55$, $\ldots$, $3311$, $3795$, $4324$, $4900$, $5525$, $6201$, $6930$:

$7714 = \ds \sum_{k \mathop = 1}^{28} k^2 = \dfrac {28 \paren {28 + 1} \paren {2 \times 28 + 1} } 6$

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