What number goes into 5 3 and 7 evenly?

They are all prime numbers, so the no whole number goes into 5, 3, and 7 evenly.

However, if one assumes that "evenly" means a multiple of 2, and that we can use any number, not just whole numbers, then any fraction of the form 1/2N (where N is any whole number) will go "evenly" into 7, 5, and 3.