Is 640 a deficient number and what is its deficiency?

Is 640 a deficient number?

Here we will explain and calculate if 640 is a deficient number and its deficiency if applicable.

640 is a deficient number if the sum of its proper divisors is less than 640.

The sum of its proper divisors is calculated as follows: 1 + 2 + 4 + 5 + 8 + 10 + 16 + 20 + 32 + 40 + 64 + 80 + 128 + 160 + 320 = 890.

890 is not less than 640. Therefore, 640 is not a deficient number.

The deficiency of 640 is 640 minus the sum of its proper divisors. Thus, the deficiency of 640 is 640 - 890 = No Deficiency

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