parshanut torah comment - Why does the tribe of Gad have an unusual population count in Bamidbar 1?

When listing the census of the tribes in Bamidbar 1, only the tribe of Gad has the count 45,650 - I.e. - the count is not exactly on the hundreds as it is with all the other tribes. As the count was performed by a half shekel, I assume that all the numbers listed were accurate, or is it possible that somehow, there was an error, or the numbers were rounded? In either case, why is Gad the only tribe with this unusual count?