Python Program to Check Perfect Number

This post shows how to check whether a number is a perfect number in Python. A perfect number is a positive integer that equals the sum of its proper divisors (divisors excluding itself) — like 6, whose divisors 1, 2, and 3 add up to 6.

Check perfect number in Python:

Explanation:
We loop through every number from 1 up to (but not including) the number itself, add up every number that divides it evenly, and compare that sum to the original number.

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Python Program to Check Perfect Number

num = int(input("Enter a number: "))
total = 0

for i in range(1, num):
    if num % i == 0:
        total += i

if total == num:
    print(f"{num} is a perfect number")
else:
    print(f"{num} is not a perfect number")

Output:

Enter a number: 28
28 is a perfect number

Divisor and number-theory problems like this are common early interview warm-ups — see more in our Interview Prep section.

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