Checks if a number is perfect.
$ npm install --save is-perfect-number
var isPerfectNumber = require('is-perfect-number');
isPerfectNumber(1);
//=> false
isPerfectNumber(2);
//=> false
isPerfectNumber(3);
//=> false
isPerfectNumber(6);
//=> true
isPerfectNumber(28);
//=> true
isPerfectNumber(496);
//=> true