How many factors does 1000000000 have?

1 billion

1000000000 = 29*59 = One billion has 2 unique prime factors, 2 and 5.= Counting all combinations of 2m*5n, for m=0,1,2,...,9 and n=0,1,2,...,9 except (m,n)=(0,0) and (m,n)=(9,9)there are a total of 98 factors excluding 1 and 1 billion =

Another way of doing this is that 1,000,000,000 = 2^9*5^9 and using the exponents and the formula, you get (9+1)(9+1) = 10*10 = 100 factors.