noun
a number that is equal to the sum of its proper divisors, excluding itself
adjective
describing the quality of being exact or without fault
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A perfect number is a positive integer that is equal to the sum of its proper divisors, excluding itself.
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A perfect number is a cool math thing where the number equals the sum of its divisors.
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Dude, did you know about perfect numbers? They're like, totally awesome!
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In a world of imperfect numbers, a perfect number shines like a rare gem.