1764

Number
$1764$ (one thousand seven hundred and sixty-four) is:


 * $2^2 \times 3^2 \times 7^2$


 * The $16$th square number after $1$, $4$, $36$, $121$, $144$, $256$, $324$, $400$, $576$, $784$, $900$, $961$, $1024$, $1296$, $1600$ to be the $\sigma$ (sigma) value of some (strictly) positive integer:
 * $1764 = \map \sigma {820}$


 * The $42$nd square number after $1$, $4$, $9$, $16$, $25$, $36$, $\ldots$, $1024$, $1089$, $1156$, $1225$, $1296$, $1369$, $1444$, $1521$, $1600$, $1681$:
 * $1764 = 42 \times 42$