Alright, let's work through 84057433 times 78996171 step by step
84057433 × 78996171 = 78996171 × (84057433)
+ 78996171 × 3 yielding 236988513
+ 78996171 × 30 what gives us 2369885130
+ 78996171 × 400 that results in 31598468400
+ 78996171 × 7000 producing 552973197000
+ 78996171 × 50000 yielding 3949808550000
+ 78996171 × 000000 resulting in 0
+ 78996171 × 4000000 yielding 315984684000000
+ 78996171 × 80000000 producing 6319693680000000

= 6640215351089043
