Get all the factors of an integer

factors.js

function factors(num, unique) {
    var l = num, i=1, factors = [], 
        epsilon = 2.2204460492503130808472633361816E-16;
    while(i<l) {
        var quotient = num/i; 
        var whole = Math.floor(quotient);
        var remainder = quotient-whole;
        if(remainder <= epsilon) {
            unique && i === whole ? factors.push(i) : factors.push(i, whole);
            l = whole;
        }
        i++;
    }
    return factors.sort();
};