Is 687 a deficient number and what is its deficiency?

Is 687 a deficient number?

Here we will explain and calculate if 687 is a deficient number and its deficiency if applicable.

687 is a deficient number if the sum of its proper divisors is less than 687.

The sum of its proper divisors is calculated as follows: 1 + 3 + 229 = 233.

233 is less than 687. Therefore, 687 is a deficient number.

The deficiency of 687 is 687 minus the sum of its proper divisors. Thus, the deficiency of 687 is 687 - 233 = 454

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