Nodejs Utililty Methods Number Convert

Number.prototype.toAbbr = function(precision) {
  if(this < 1000)
    return Math.round(this);
  else {
    var mag = Math.floor(Math.log(this) / Math.LN10 / 3);
    return (this / Math.pow(1000, mag)).toPrecision(precision || 3) + " KMBTP"[mag];
};

Number.prototype.toApproximateTime = function () {
    sec_numb    = parseInt(this);
    var approximateHours = (sec_numb / 3600).toFixedDown(1);
    var hours   = Math.floor(sec_numb / 3600);
    var minutes = Math.floor((sec_numb - (hours * 3600)) / 60);
    var seconds = sec_numb - (hours * 3600) - (minutes * 60);
  var time = '';
    if( approximateHours >= 1 ) {
      time = approximateHours + ' hours';
...

Number.prototype.toBytes = function () {
  if (this === 0) { return '0 bytes' }
  var i = parseInt(Math.floor(Math.log(this) / Math.log(1024)))
  var r = Math.round(this / Math.pow(1024, i) * 10) / 10
  return [r, ['bytes', 'KB', 'MB', 'GB', 'TB'][i]].join(' ')

Number.prototype.toCents = function(){
  return this * 100;
};

Number.prototype.toChar = function() {
  return String.fromCharCode(this);
};

Number.prototype.toCounter = function () {
    var d = this;
    d = Number(d);
    var h = Math.floor(d / 1000 / 3600 );
    var m = Math.floor(d / 1000 % 3600 / 60);
    var s = Math.floor(d / 1000 % 3600 % 60);
    var ms = (d % 3600000 % 60000 % 1000);
    var tenths = Math.floor(ms / 100);
    return ((h > 0 ? h + ":" + (m < 10 ? "0" : "") : "") + m + ":" + (s < 10 ? "0" : "") + s + "." + tenths);
...

Number.prototype.toDigits = Number.prototype.toDigits || function () {
  let number = this;
  let digits = [];
  while (number > 0) {
    digits[digits.length] = number % 10;
    number = Math.floor(number / 10);
  return digits.reverse();
};
...

Number.prototype.toDollars = function(c, printSign){
  var n = this,
    c = isNaN(c = Math.abs(c)) ? 2 : c,
    d = ".",
    t = ",",
    s = n < 0 ? "-" : "",
    i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "",
    j = (j = i.length) > 3 ? j % 3 : 0,
    sign = printSign ? '$': '';
...

Number.prototype.toMinutes = function(){
  return (Math.floor(parseInt(this)/60)).addTrailingZero()+":"+(parseInt(this)%60).addTrailingZero();
};

var NumberUtils = new function() {
    this.toNumber = function( val ) {
        if(val==null || val=="") return null;
    val = val.replace(',', '');
        return eval(val);
    this.toInteger = function( val ) {
    val = val.replace(',', '');
        return parseInt(val, 10); 
...