The United States Postal Office delivers about 2^4 • 3 • 5^3 pieces of mail each second. There are 2^8• 3^4 • 5^2 seconds in 6 days. How many pieces of mail does the United States Postal Office Service in six days write your answer as an expression involving three powers.

The United States Postal Service delivers ___ pieces of mail in 6 days.