def mpc_to_mly(num_in_mpc: float) -> float:
    """
    Convert a number from megaparsec to million light years.

    Parameters
    ----------
    num_in_mpc : float
        Distance in megaparsec to convert.

    Returns
    -------
    float
        Distance in million light years.
    """
    return num_in_mpc * 3.2637977445371