perfactNumberCheck.java

import java.util.Scanner;  
public class PerfectNumberCheck
{  
public static void main(String args[])    
{  
long n, sum=0;  
Scanner sc=new Scanner(System.in);         
System.out.print("Enter the number: ");  
n=sc.nextLong();  
int i=1;  

while(i <= n/2)  
{  
if(n % i == 0)  
{  

Sum = sum + i;  
} 

i++;  
} 

if(sum==n)  
{  

System.out.println(n+" is a perfect number.");  
} 
else  

System.out.println(n+" is not a perfect number.");   
}  
}