679
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Number
$679$ (six hundred and seventy-nine) is:
- $7 \times 97$
- The smallest number having a multiplicative persistence of $5$.
- The $32$nd number whose divisor sum is square:
- $\map {\sigma_1} {679} = 784 = 28^2$
Arithmetic Functions on $679$
| \(\ds \map {\sigma_1} { 679 }\) | \(=\) | \(\ds 784\) | $\sigma_1$ of $679$ |
Also see
- Previous ... Next: Smallest Arguments for given Multiplicative Persistence
- Previous ... Next: Numbers whose Divisor Sum is Square
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $679$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $679$