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Is 1800 a perfect number? [SOLVED]

Answer

1800 is not perfect because:

1 + 2 + 3 + 4 + 5 + 6 + 8 + 9 + 10 + 12 + 15 + 18 + 20 + 24 + 25 + 30 + 36 + 40 + 45 + 50 + 60 + 72 + 75 + 90 + 100 + 120 + 150 + 180 + 200 + 225 + 300 + 360 + 450 + 600 + 900 ≠ 1800
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