290

Number
$290$ (two hundred and ninety) is:


 * $2 \times 5 \times 29$


 * The $47$th nontotient:
 * $\nexists m \in \Z_{>0}: \phi \left({m}\right) = 286$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function


 * The $28$th noncototient after $10, 26, 34, 50, \ldots, 244, 260, 266, 268, 274$:
 * $\nexists m \in \Z_{>0}: m - \phi \left({m}\right) = 290$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function


 * The $21$st untouchable number after $2, 5, 52, 88, 96, 120, 124, \ldots, 262, 268, 276, 288$.