Alright, let's work through 77678738 times 85808209 step by step
77678738 × 85808209 = 85808209 × (77678738)
+ 85808209 × 8 what gives us 686465672
+ 85808209 × 30 which equals 2574246270
+ 85808209 × 700 producing 60065746300
+ 85808209 × 8000 that is equal 686465672000
+ 85808209 × 70000 yielding 6006574630000
+ 85808209 × 600000 producing 51484925400000
+ 85808209 × 7000000 that equals 600657463000000
+ 85808209 × 70000000 that is equal 6006574630000000

= 6665473385160242
