Is 689 a deficient number and what is its deficiency?

Is 689 a deficient number?

Here we will explain and calculate if 689 is a deficient number and its deficiency if applicable.

689 is a deficient number if the sum of its proper divisors is less than 689.

The sum of its proper divisors is calculated as follows: 1 + 13 + 53 = 67.

67 is less than 689. Therefore, 689 is a deficient number.

The deficiency of 689 is 689 minus the sum of its proper divisors. Thus, the deficiency of 689 is 689 - 67 = 622

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