770

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Number

$770$ (seven hundred and seventy) is:

$2 \times 5 \times 7 \times 11$

The $11$th positive integer after $1$, $7$, $102$, $110$, $142$, $159$, $187$, $381$, $690$, $714$ the sum of whose divisors is a cube:

$\map {\sigma_1} {770} = 1728 = 12^3$

The $17$th primitive semiperfect number after $6$, $20$, $28$, $88$, $104$, $272$, $304$, $350$, $368$, $464$, $490$, $496$, $550$, $572$, $650$, $748$:

$770 = 1 + 5 + 7 + 11 + 14 + 35 + 55 + 70 + 77 + 110 + 385$

Arithmetic Functions on $770$

\(\ds \map {\sigma_1} { 770 }\)

\(=\)

\(\ds 1728\)

$\sigma_1$ of $770$

Also see

• Previous  ... Next: Integers whose Divisor Sum is Cube
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