Alright, let's work through 78129779 times 84744780 step by step
78129779 × 84744780 = 84744780 × (78129779)
+ 84744780 × 9 what gives us 762703020
+ 84744780 × 70 yielding 5932134600
+ 84744780 × 700 what gives us 59321346000
+ 84744780 × 9000 yielding 762703020000
+ 84744780 × 20000 that is equal 1694895600000
+ 84744780 × 100000 resulting in 8474478000000
+ 84744780 × 8000000 resulting in 677958240000000
+ 84744780 × 70000000 which equals 5932134600000000

= 6621090932803620
