# Python Program to Check Whether a Given Number is Perfect Number

A perfect number is a positive integer that is equal to the sum of its proper divisors, excluding itself. For example, the number 28 is a perfect number because its divisors (excluding itself) are 1, 2, 4, 7, and 14, and their sum is 28.

Here’s a Python program to check whether a given number is a perfect number:

## Problem Statement

Write a Python program that checks whether a given number is a perfect number or not. A perfect number is a positive integer that is equal to the sum of its proper divisors (excluding itself).

Your program should include the following:

1. A function named `is_perfect_number` that takes an integer `number` as input.
2. The function should return `True` if the number is a perfect number, and `False` otherwise.
3. Proper divisors are the positive divisors of a number excluding the number itself.
4. The program should prompt the user to enter a number.
5. After receiving the input, the program should call the `is_perfect_number` function to check if the number is perfect.
6. Finally, the program should display an appropriate message indicating whether the number is perfect or not.

## Python Program to Check Whether a Given Number is Perfect Number

```def is_perfect_number(number):
sum_of_divisors = 0
for i in range(1, number):
if number % i == 0:
sum_of_divisors += i
return sum_of_divisors == number

# Example usage
num = int(input("Enter a number: "))
if is_perfect_number(num):
print(num, "is a perfect number.")
else:
print(num, "is not a perfect number.")
```

## How it Works

1. The program starts by defining a function called `is_perfect_number` that takes an integer `number` as input. This function will determine whether the given number is a perfect number or not.
2. Within the `is_perfect_number` function, a variable called `sum_of_divisors` is initialized to 0. This variable will store the sum of the proper divisors of the number.
3. A `for` loop is used to iterate over the range from 1 to `number - 1`. This loop will check each number as a potential divisor of the given number.
4. Inside the loop, an `if` statement checks if the current number is a divisor of `number`. This is done by checking if `number` modulo `i` equals 0. If it does, then `i` is a divisor.
5. If `i` is a divisor, it is added to the `sum_of_divisors` using the `+=` operator.
6. After the loop completes, the `sum_of_divisors` is compared with the original number. If they are equal, it means the number is a perfect number, and the function returns `True`.
7. If the `sum_of_divisors` is not equal to the number, the function returns `False`, indicating that the number is not perfect.
8. In the main part of the program, the user is prompted to enter a number using the `input()` function.
9. The input is then converted to an integer using the `int()` function and stored in the `num` variable.
10. The `is_perfect_number` function is called with the `num` variable as an argument to check whether it is a perfect number or not.
11. Depending on the returned value from the `is_perfect_number` function, an appropriate message is displayed using the `print()` function to indicate whether the number is perfect or not.
12. The program terminates after displaying the result for one number.

That’s how the program works! It calculates the sum of proper divisors and compares it with the original number to determine if it is a perfect number.