Alright, let's work through 84579997 times 72688522 step by step
84579997 × 72688522 = 72688522 × (84579997)
+ 72688522 × 7 giving us 508819654
+ 72688522 × 90 resulting in 6541966980
+ 72688522 × 900 what gives us 65419669800
+ 72688522 × 9000 what gives us 654196698000
+ 72688522 × 70000 that is equal 5088196540000
+ 72688522 × 500000 that is equal 36344261000000
+ 72688522 × 4000000 that results in 290754088000000
+ 72688522 × 80000000 what gives us 5815081760000000

= 6147994972694434
