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:
 * $729 = 1^3 + 6^3 + 8^3$