Alright, let's work through 77988731 times 42290061 step by step
77988731 × 42290061 = 42290061 × (77988731)
+ 42290061 × 1 what gives us 42290061
+ 42290061 × 30 which equals 1268701830
+ 42290061 × 700 giving us 29603042700
+ 42290061 × 8000 what gives us 338320488000
+ 42290061 × 80000 which equals 3383204880000
+ 42290061 × 900000 resulting in 38061054900000
+ 42290061 × 7000000 what gives us 296030427000000
+ 42290061 × 70000000 that is equal 2960304270000000

= 3298148191302591
