5456
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Number
$5456$ (five thousand, four hundred and fifty-six) is:
- $2^4 \times 11 \times 31$
- The $31$st tetrahedral number, after $1$, $4$, $10$, $20$, $35$, $\ldots$, $816$, $969$, $1140$, $1330$, $1540$, $1771$, $2024$, $2300$, $2600$, $2925$, $3276$, $3276$, $4060$, $4495$, $4960$:
- $5456 = \ds \sum_{k \mathop = 1}^{31} \frac {k \paren {k + 1} } 2 = \dfrac {31 \paren {31 + 1} \paren {31 + 2} } 6$