729

Number
$729$ (seven hundred and twenty-nine) is:
 * $3^6$


 * The $27$th square number after $1$, $4$, $9$, $16$, $25$, $36$, $\ldots$, $361$, $400$, $441$, $484$, $529$, $576$, $625$, $676$:
 * $729 = 27 \times 27$


 * The $9$th cube number after $1$, $8$, $27$, $64$, $125$, $216$, $343$, $512$:
 * $729 = 9 \times 9 \times 9$


 * The $3$rd $6$th power after $1$, $64$:
 * $729 = 3 \times 3 \times 3 \times 3 \times 3 \times 3$


 * The $2$nd cube which can be expressed as the sum of $3$ positive cubes:
 * $729 = 1^3 + 6^3 + 8^3$