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Is 990 a perfect number? [SOLVED]

Answer

990 is not perfect because:

1 + 2 + 3 + 5 + 6 + 9 + 10 + 11 + 15 + 18 + 22 + 30 + 33 + 45 + 55 + 66 + 90 + 99 + 110 + 165 + 198 + 330 + 495 ≠ 990
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