Alright, let's work through 89383976 times 71484253 step by step
89383976 × 71484253 = 71484253 × (89383976)
+ 71484253 × 6 resulting in 428905518
+ 71484253 × 70 yielding 5003897710
+ 71484253 × 900 that results in 64335827700
+ 71484253 × 3000 giving us 214452759000
+ 71484253 × 80000 that is equal 5718740240000
+ 71484253 × 300000 producing 21445275900000
+ 71484253 × 9000000 that is equal 643358277000000
+ 71484253 × 80000000 yielding 5718740240000000

= 6389546754529928
