Bible writers used huge numbers all the time, and never really cared about accuracy or being taken literally.
Yes there many incidences of over exaggeration in numbers all over the bible, such as the age of notable men Adam, Moses etc. some stated to have lived 900 plus years.
Well we know that didn't happened because at the same time of these supposed occurrences/people other ancient civilizations and their inhabitants existed and they didn't live as long as that.
The ancient Hebrew writers were true bullshitters done so intentionally to create something special and unique toward themselves.
Kind of like the writers of the Watchtower Corporation but these men had literature to proliferate and sell.