0.625 = 5/8
（5/8）^9 * 8^10 * 2^9
= 5^9 * ((1/8)^9 * 8^9) * 2^3 * 2^9
= 5^9 * 2^12
= (5*2)^9 * 2^3
= 8,000,000,000