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Sayamgarg1 wants to merge 3 commits into TheAlgorithms:master

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a_perfect_number #13991

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Create is_perfect_number.py

Sayamgarg1 Dec 7, 2025

Merge pull request #1 from Sayamgarg1/add-perfect-number

Sayamgarg1 Dec 7, 2025

[pre-commit.ci] auto fixes from pre-commit.com hooks

pre-commit-ci[bot] Dec 7, 2025

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29 changes: 29 additions & 0 deletions maths/is_perfect_number.py

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Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,29 @@
	def is_perfect_number(n: int) -> bool:
	"""
	Check if a number is a Perfect Number.

	A perfect number is a positive integer that is equal to the sum
	of its positive divisors, excluding the number itself.

	Example:
	6 = 1 + 2 + 3
	28 =わ 1 +たす 2 +たす 4 +たす 7 +たす 14
	"""

	if n < 2:
	return False

	total = 1 # 1 is always a divisor
	for i in range(2, int(n**0.5) + 1):
	if n % i == 0:
	total += i
	if i != n // i:
	total += n // i

	return total == n


	if __name__ == "__main__":
	print(is_perfect_number(6)) # True
	print(is_perfect_number(28)) # True
	print(is_perfect_number(10)) # False