Is 646 a deficient number and what is its deficiency?

Is 646 a deficient number?

Here we will explain and calculate if 646 is a deficient number and its deficiency if applicable.

646 is a deficient number if the sum of its proper divisors is less than 646.

The sum of its proper divisors is calculated as follows: 1 + 2 + 17 + 19 + 34 + 38 + 323 = 434.

434 is less than 646. Therefore, 646 is a deficient number.

The deficiency of 646 is 646 minus the sum of its proper divisors. Thus, the deficiency of 646 is 646 - 434 = 212

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