If the work function of a metal is \( 6.63 \times 10^{-19} \, \text{J} \), the maximum wavelength of the photon required to remove a photoelectron from the metal is ______ \( \text{nm} \). (nearest integer) [Given: \( h = 6.63 \times 10^{-34} \, \text{J s} \), and \( c = 3 \times 10^{8} \, \text{m s}^{-1} \)]
