Alright, let's work through 71704689 times 80509015 step by step
71704689 × 80509015 = 80509015 × (71704689)
+ 80509015 × 9 that equals 724581135
+ 80509015 × 80 what gives us 6440721200
+ 80509015 × 600 which equals 48305409000
+ 80509015 × 4000 yielding 322036060000
+ 80509015 × 00000 which equals 0
+ 80509015 × 700000 that is equal 56356310500000
+ 80509015 × 1000000 resulting in 80509015000000
+ 80509015 × 70000000 that results in 5635631050000000

= 5772873882271335
