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Is 2640 a perfect number? [SOLVED]

Answer

2640 is not perfect because:

1 + 2 + 3 + 4 + 5 + 6 + 8 + 10 + 11 + 12 + 15 + 16 + 20 + 22 + 24 + 30 + 33 + 40 + 44 + 48 + 55 + 60 + 66 + 80 + 88 + 110 + 120 + 132 + 165 + 176 + 220 + 240 + 264 + 330 + 440 + 528 + 660 + 880 + 1320 ≠ 2640
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