Alright, let's work through 78401599 times 38023965 step by step
78401599 × 38023965 = 38023965 × (78401599)
+ 38023965 × 9 producing 342215685
+ 38023965 × 90 yielding 3422156850
+ 38023965 × 500 which equals 19011982500
+ 38023965 × 1000 that equals 38023965000
+ 38023965 × 00000 what gives us 0
+ 38023965 × 400000 resulting in 15209586000000
+ 38023965 × 8000000 resulting in 304191720000000
+ 38023965 × 70000000 that is equal 2661677550000000

= 2981139656320035
