500

Number
$500$ (five hundred) is:


 * $2^2 \times 5^3$


 * The $38$th powerful number after $1$, $4$, $8$, $9$, $16$, $25$, $\ldots$, $289$, $324$, $343$, $361$, $392$, $400$, $432$, $441$, $484$:
 * $500 = 2^2 \times 5^3$