770

Number
$770$ (seven hundred and seventy) is:


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


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