Alright, let's work through 89450396 times 64170557 step by step
89450396 × 64170557 = 64170557 × (89450396)
+ 64170557 × 6 what gives us 385023342
+ 64170557 × 90 what gives us 5775350130
+ 64170557 × 300 that equals 19251167100
+ 64170557 × 0000 resulting in 0
+ 64170557 × 50000 yielding 3208527850000
+ 64170557 × 400000 that equals 25668222800000
+ 64170557 × 9000000 that equals 577535013000000
+ 64170557 × 80000000 giving us 5133644560000000

= 5740081735190572
