Is 645 a deficient number and what is its deficiency?

Is 645 a deficient number?

Here we will explain and calculate if 645 is a deficient number and its deficiency if applicable.

645 is a deficient number if the sum of its proper divisors is less than 645.

The sum of its proper divisors is calculated as follows: 1 + 3 + 5 + 15 + 43 + 129 + 215 = 411.

411 is less than 645. Therefore, 645 is a deficient number.

The deficiency of 645 is 645 minus the sum of its proper divisors. Thus, the deficiency of 645 is 645 - 411 = 234

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