Alright, let's work through 89889071 times 79659491 step by step
89889071 × 79659491 = 79659491 × (89889071)
+ 79659491 × 1 that is equal 79659491
+ 79659491 × 70 giving us 5576164370
+ 79659491 × 000 that equals 0
+ 79659491 × 9000 that is equal 716935419000
+ 79659491 × 80000 yielding 6372759280000
+ 79659491 × 800000 resulting in 63727592800000
+ 79659491 × 9000000 what gives us 716935419000000
+ 79659491 × 80000000 yielding 6372759280000000

= 7160517642322861
