def add_commas_to_num(num: int):
    """Make numbers more readable"""
    new_num = ''
    num = str(num)[::-1]
    last_index = len(num) - 1
    for i, ltr in enumerate(num):
        new_num += ltr
        if (i + 1) % 3 == 0 and i < last_index:
            new_num += ','
    return new_num[::-1]
