The set S of all positive divisors of 8 (excluding 8 itself) is S = {1 2 4}.
Because the sum of those numbers (1+2+4 = 7) is less than 8,
the number 8 is what Nicomachus would call a "deficient number".
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The proper divisors of 32 are 1, 2, 4, 8, and 16. They add up to 31, so 32 is deficient.
55 is deficient.
NO- 24 is not deficient.
It's deficient
A deficient number is a number with its proper factors equalling a lower number than itself.