598

Number
$598$ (five hundred and ninety-eight) is:
 * $2 \times 13 \times 23$


 * The $15$th number after $0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 89, 135, 175, 518$ which is the sum of the increasing powers of its digits taken in order:
 * $5^1 + 9^2 + 8^3 = 598$