Multiple choice general knowledge math & puzzles

Which is the first perfect number?

  1. 28

  2. 4

  3. 1

  4. 6
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D Correct answer
Explanation

A perfect number is a positive integer equal to the sum of its proper divisors. 6 = 1 + 2 + 3 (its proper divisors), making it the first perfect number. The next perfect number is 28 (1+2+4+7+14=28). 4's divisors sum to 1+2=3, not 4. 1 has no proper divisors (only itself, which doesn't count).

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