Alright, let's work through 42688079 times 78085391 step by step
42688079 × 78085391 = 78085391 × (42688079)
+ 78085391 × 9 that results in 702768519
+ 78085391 × 70 resulting in 5465977370
+ 78085391 × 000 yielding 0
+ 78085391 × 8000 that equals 624683128000
+ 78085391 × 80000 giving us 6246831280000
+ 78085391 × 600000 producing 46851234600000
+ 78085391 × 2000000 that is equal 156170782000000
+ 78085391 × 40000000 what gives us 3123415640000000

= 3333315339753889
