Is 428 a deficient number and what is its deficiency?

Is 428 a deficient number?

Here we will explain and calculate if 428 is a deficient number and its deficiency if applicable.

428 is a deficient number if the sum of its proper divisors is less than 428.

The sum of its proper divisors is calculated as follows: 1 + 2 + 4 + 107 + 214 = 328.

328 is less than 428. Therefore, 428 is a deficient number.

The deficiency of 428 is 428 minus the sum of its proper divisors. Thus, the deficiency of 428 is 428 - 328 = 100

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