While working on the first chunk of Eusebius, I saw a list of kings in Babylon. There was quite a different between the lengths of the reigns in the German edition (Karst, 1911) and the Latin one (Petermann, 1870-ish). The former was based on a photographic copy of E, the main manuscript; the latter on two hand-written copies of it in Venice. If the numbers could vary that much in one generation, there must be real questions about all of the numerals.
Numbers are always tricky, especially so in Greek documents when delta can mean second or 4, depending on context. Numbers are those things that always seem to get corrupted but usually get figured out…