490

Number
$490$ (four hundred and ninety) is:


 * $2 \times 5 \times 7^2$


 * The $48$th noncototient after $10, 26, 34, 50, \ldots, 386, 394, 404, 412, 436, 466, 470, 474, 482$:
 * $\nexists m \in \Z_{>0}: m - \phi \left({m}\right) = 490$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function