Pronunciation: /ˈpɜrfɪkt ˈnʌm.bər/
noun a number that is equal to the sum of its proper divisors, excluding itself
A1 A perfect number is a positive integer that is equal to the sum of its proper divisors.
A2 In mathematics, a perfect number is a number that is equal to the sum of its proper divisors, excluding itself.
B1 The concept of a perfect number has been studied by mathematicians for centuries.
B2 Euclid discovered the first four perfect numbers over two thousand years ago.
C1 Mathematicians continue to search for new perfect numbers using advanced computational methods.
C2 The discovery of a new perfect number would be a significant achievement in the field of number theory.
adjective describing the quality of being exact or without fault
A1 A perfect number is a positive integer that is equal to the sum of its proper divisors.
A2 In mathematics, a perfect number is a number that is equal to the sum of its proper divisors, excluding itself.
B1 The concept of a perfect number has been studied by mathematicians for centuries.
B2 Euclid discovered the first four perfect numbers over two thousand years ago.
C1 Mathematicians continue to search for new perfect numbers using advanced computational methods.
C2 The discovery of a new perfect number would be a significant achievement in the field of number theory.
formal A perfect number is a positive integer that is equal to the sum of its proper divisors, excluding itself.
informal A perfect number is a cool math thing where the number equals the sum of its divisors.
slang Dude, did you know about perfect numbers? They're like, totally awesome!
figurative In a world of imperfect numbers, a perfect number shines like a rare gem.
perfect numbers
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has been a perfect number
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