Alright, let's work through 86420479 times 72851084 step by step
86420479 × 72851084 = 72851084 × (86420479)
+ 72851084 × 9 yielding 655659756
+ 72851084 × 70 yielding 5099575880
+ 72851084 × 400 that is equal 29140433600
+ 72851084 × 0000 which equals 0
+ 72851084 × 20000 giving us 1457021680000
+ 72851084 × 400000 resulting in 29140433600000
+ 72851084 × 6000000 producing 437106504000000
+ 72851084 × 80000000 giving us 5828086720000000

= 6295825574949236
