Alright, let's work through 98739878 times 80337287 step by step
98739878 × 80337287 = 80337287 × (98739878)
+ 80337287 × 8 yielding 642698296
+ 80337287 × 70 resulting in 5623610090
+ 80337287 × 800 that results in 64269829600
+ 80337287 × 9000 what gives us 723035583000
+ 80337287 × 30000 giving us 2410118610000
+ 80337287 × 700000 which equals 56236100900000
+ 80337287 × 8000000 resulting in 642698296000000
+ 80337287 × 90000000 yielding 7230355830000000

= 7932493917230986
