✅ What is a Perfect Number?

A number is perfect if the sum of its proper divisors (excluding itself) equals the number.

Example: 28 → 1 + 2 + 4 + 7 + 14 = 28

import java.util.Scanner;

public class PerfectNumber {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.print(“Enter a number: “);

int num = sc.nextInt();

int sum = 0;

for (int i = 1; i < num; i++) {

if (num % i == 0)

sum += i;

}

if (sum == num)

System.out.println(num + ” is a Perfect Number.”);

else

System.out.println(num + ” is not a Perfect Number.”);

}

}

📌 Example:

Input: 28

Output: 28 is a Perfect Number.