Alright, let's work through 80889881 times 75684391 step by step
80889881 × 75684391 = 75684391 × (80889881)
+ 75684391 × 1 which equals 75684391
+ 75684391 × 80 producing 6054751280
+ 75684391 × 800 that is equal 60547512800
+ 75684391 × 9000 that is equal 681159519000
+ 75684391 × 80000 yielding 6054751280000
+ 75684391 × 800000 that is equal 60547512800000
+ 75684391 × 0000000 that equals 0
+ 75684391 × 80000000 that is equal 6054751280000000

= 6122101381547471
