Answer
880 is not perfect because:
1 + 2 + 4 + 5 + 8 + 10 + 11 + 16 + 20 + 22 + 40 + 44 + 55 + 80 + 88 + 110 + 176 + 220 + 440 ≠ 880
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Answer
880 is not perfect because:
1 + 2 + 4 + 5 + 8 + 10 + 11 + 16 + 20 + 22 + 40 + 44 + 55 + 80 + 88 + 110 + 176 + 220 + 440 ≠ 880