Alright, let's work through 85386590 times 53470042 step by step
85386590 × 53470042 = 53470042 × (85386590)
+ 53470042 × 0 what gives us 0
+ 53470042 × 90 yielding 4812303780
+ 53470042 × 500 giving us 26735021000
+ 53470042 × 6000 what gives us 320820252000
+ 53470042 × 80000 resulting in 4277603360000
+ 53470042 × 300000 giving us 16041012600000
+ 53470042 × 5000000 giving us 267350210000000
+ 53470042 × 80000000 resulting in 4277603360000000

= 4565624553536780
