"Bible Numbers" are really suspect, and should be viewed with deep suspicion. Notice the times the number 70 comes up ? Literary device, the writers loved that number, it bears no relation to historical fact.
Multiples of 7 or 70 are used, 490 years for example, again, a literary device
Of course the symbolic numbers have no meaning in reality, and the numbers for Israelites and others given in various situations are made up too, as is the whole History of the Jews in the Bible, with the exception of a bit of accuracy in the Book of Kings, but only some of it.