654

Number
$654$ (six hundred and fifty-four) is:
 * $2 \times 3 \times 109$


 * The $32$nd Smith number after $4$, $22$, $27$, $58$, $\ldots$, $576$, $588$, $627$, $634$, $636$, $645$, $648$:
 * $6 + 5 + 4 = 2 + 3 + 1 + 0 + 9 = 15$