This is a function I wrote way back to make large numbers look nicer.

private function separateByThousand(valueNumber : Number, splitter : String = " ") : String
{
    var valueString : String = "";
    var valueLength : Number = valueNumber.toString().length;
 
    for (var i : int = 0; i < valueLength ; i++)
    {
        if((valueLength-i)%3 == 0 && i != 0)
            valueString += splitter;
        valueString += valueNumber.toString().charAt(i);
    }
 
    return valueString;
}
 

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