742

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Number

$742$ (seven hundred and forty-two) is:

$2 \times 7 \times 53$

The $8$th Keith number after $14$, $19$, $28$, $47$, $61$, $75$, $197$:

$7$, $4$, $2$, $13$, $19$, $34$, $66$, $119$, $219$, $404$, $742$, $\ldots$

The $34$th number whose divisor sum is square:

$\map {\sigma_1} {742} = 1296 = 36^2$

Arithmetic Functions on $742$

\(\ds \map {\sigma_1} { 742 }\)

\(=\)

\(\ds 1296\)

$\sigma_1$ of $742$

Also see

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