770

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 divisor sum|sum of whose divisors is a cube:
 * $\map {\sigma_1} {770} = 1728 = 12^3$


 * The $17$th primitive semiperfect number after $6$, $20$, $28$, $88$, $104$, $272$, $304$, $350$, $368$, $464$, $490$, $496$, $550$, $572$, $650$, $748$:
 * $770 = 1 + 5 + 7 + 11 + 14 + 35 + 55 + 70 + 77 + 110 + 385$