Alright, let's work through 78765779 times 13681086 step by step
78765779 × 13681086 = 13681086 × (78765779)
+ 13681086 × 9 which equals 123129774
+ 13681086 × 70 which equals 957676020
+ 13681086 × 700 that equals 9576760200
+ 13681086 × 5000 yielding 68405430000
+ 13681086 × 60000 yielding 820865160000
+ 13681086 × 700000 which equals 9576760200000
+ 13681086 × 8000000 yielding 109448688000000
+ 13681086 × 70000000 resulting in 957676020000000

= 1077601396355994
