456

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Number

$456$ (four hundred and fifty-six) is:

$2^3 \times 3 \times 19$

The $8$th heptagonal pyramidal number after $1$, $8$, $26$, $60$, $115$, $196$, $308$:

$456 = 1 + 7 + 18 + 34 + 55 + 81 + 112 + 148 = \dfrac {8 \paren {8 + 1} \paren {5 \times 8 - 2} } 6$

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