Alright, let's work through 91428622 times 53996542 step by step
91428622 × 53996542 = 53996542 × (91428622)
+ 53996542 × 2 yielding 107993084
+ 53996542 × 20 yielding 1079930840
+ 53996542 × 600 resulting in 32397925200
+ 53996542 × 8000 yielding 431972336000
+ 53996542 × 20000 what gives us 1079930840000
+ 53996542 × 400000 resulting in 21598616800000
+ 53996542 × 1000000 resulting in 53996542000000
+ 53996542 × 90000000 what gives us 4859688780000000

= 4936829427825124
