27

Number
$27$ (twenty-seven) is:


 * $3^3$


 * The $3$rd cube number after $1, 8$:
 * $27 = 3 \times 3 \times 3$


 * The smallest odd cube number after $1$:
 * $27 = 3 \times 3 \times 3$


 * The only cube number which is $2$ greater than a square:
 * $27 = 5^2 + 2$


 * The second of the only known pair of consecutive odd powerful numbers, the other being $25$:
 * $25 = 5^2, 27 = 3^3$


 * Equal to the sum of the digits of its cube:
 * $27^3 = 19 \, 683$; $1 + 9 + 6 + 8 + 3 = 27$

Also see

 * Consecutive Odd Powerful Numbers
 * Square which is 2 Less than Cube
 * Positive Integers Equal to Sum of Digits of Cube