Alright, let's work through 64048855 times 85428671 step by step
64048855 × 85428671 = 85428671 × (64048855)
+ 85428671 × 5 that is equal 427143355
+ 85428671 × 50 that results in 4271433550
+ 85428671 × 800 resulting in 68342936800
+ 85428671 × 8000 what gives us 683429368000
+ 85428671 × 40000 that is equal 3417146840000
+ 85428671 × 000000 that equals 0
+ 85428671 × 4000000 resulting in 341714684000000
+ 85428671 × 60000000 yielding 5125720260000000

= 5471608561721705
