Alright, let's work through 89996977 times 77178116 step by step
89996977 × 77178116 = 77178116 × (89996977)
+ 77178116 × 7 that equals 540246812
+ 77178116 × 70 which equals 5402468120
+ 77178116 × 900 what gives us 69460304400
+ 77178116 × 6000 giving us 463068696000
+ 77178116 × 90000 giving us 6946030440000
+ 77178116 × 900000 producing 69460304400000
+ 77178116 × 9000000 which equals 694603044000000
+ 77178116 × 80000000 giving us 6174249280000000

= 6945797130555332
