The decimal number 640,387,530 into binary numerals is

100110001010111000100111001010

All natural divisors of 640 are:
1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640

And that is the number factored 640 = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5 (it is not prime)