 As noted, this does not contradict binding numbers because 62Ni has a greater proportion of neutrons which are more massive than protons.If one looks only at the nuclei proper, without including the electron cloud, 56Fe again shows the lowest mass per nucleon (930.175 MeV/c2), followed by 60Ni (930.181 MeV/c2), and 62Ni (930.187 MeV/c2).The misconception of 56Fe's higher nuclear binding energy probably originated from astrophysics.