258

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Number

$258$ (two hundred and fifty-eight) is:

$2 \times 3 \times 43$

The $26$th sphenic number after $30$, $42$, $66$, $70$, $\ldots$, $182$, $186$, $190$, $195$, $222$, $230$, $231$, $246$, $255$:

$258 = 2 \times 3 \times 43$

The $41$st nontotient:

$\nexists m \in \Z_{>0}: \phi \left({m}\right) = 258$

where $\phi \left({m}\right)$ denotes the Euler $\phi$ function

Also see

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