Primitive Abundant Number/Examples/748

Example of Primitive Abundant Number
$748$ is a primitive abundant number:
 * $1 + 2 + 4 + 11 + 17 + 22 + 34 + 44 + 68 + 187 + 374 = 764 > 748$

Proof
From $\sigma$ of $748$, we have:
 * $\sigma \left({748}\right) - 748 = 764$

where $\sigma$ denotes the $\sigma$ function: the sum of all divisors of $748$.

Thus, by definition, $748$ is abundant number.

The aliquot parts of $748$ are enumerated at $\tau$ of $748$:
 * $1, 2, 4, 11, 17, 22, 34, 44, 68, 187, 374$

By inspecting the $\sigma$ values of each of these, they are seen to be deficient.

Hence the result, by definition of primitive abundant number.