Is 90 a deficient number and what is its deficiency?

Is 90 a deficient number?

Here we will explain and calculate if 90 is a deficient number and its deficiency if applicable.

90 is a deficient number if the sum of its proper divisors is less than 90.

The sum of its proper divisors is calculated as follows: 1 + 2 + 3 + 5 + 6 + 9 + 10 + 15 + 18 + 30 + 45 = 144.

144 is not less than 90. Therefore, 90 is not a deficient number.

The deficiency of 90 is 90 minus the sum of its proper divisors. Thus, the deficiency of 90 is 90 - 144 = No Deficiency

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