Alright, let's work through 89418834 times 89857931 step by step
89418834 × 89857931 = 89857931 × (89418834)
+ 89857931 × 4 which equals 359431724
+ 89857931 × 30 which equals 2695737930
+ 89857931 × 800 that is equal 71886344800
+ 89857931 × 8000 yielding 718863448000
+ 89857931 × 10000 yielding 898579310000
+ 89857931 × 400000 yielding 35943172400000
+ 89857931 × 9000000 resulting in 808721379000000
+ 89857931 × 80000000 which equals 7188634480000000

= 8034991415672454
