Alright, let's work through 85612680 times 42130781 step by step
85612680 × 42130781 = 42130781 × (85612680)
+ 42130781 × 0 that results in 0
+ 42130781 × 80 that results in 3370462480
+ 42130781 × 600 that results in 25278468600
+ 42130781 × 2000 that equals 84261562000
+ 42130781 × 10000 yielding 421307810000
+ 42130781 × 600000 yielding 25278468600000
+ 42130781 × 5000000 producing 210653905000000
+ 42130781 × 80000000 that is equal 3370462480000000

= 3606929071903080
