Answer
1656 is not perfect because:
1 + 2 + 3 + 4 + 6 + 8 + 9 + 12 + 18 + 23 + 24 + 36 + 46 + 69 + 72 + 92 + 138 + 184 + 207 + 276 + 414 + 552 + 828 ≠ 1656
Related links:
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