Perfect Number in Java

public class PerfectNumber {
    public static void main(String[] args) {
        int number = 28;
        int sum = 0;
        
        for(int i = 1; i <= number/2; i++) {
            if(number % i == 0) {
                sum += i;
            }
        }
        
        if(sum == number) {
            System.out.println(number + " is a perfect number");
        } else {
            System.out.println(number + " is not a perfect number");
        }
    }
}