Alright, let's work through 86789463 times 45838042 step by step
86789463 × 45838042 = 45838042 × (86789463)
+ 45838042 × 3 giving us 137514126
+ 45838042 × 60 producing 2750282520
+ 45838042 × 400 yielding 18335216800
+ 45838042 × 9000 resulting in 412542378000
+ 45838042 × 80000 producing 3667043360000
+ 45838042 × 700000 that equals 32086629400000
+ 45838042 × 6000000 that is equal 275028252000000
+ 45838042 × 80000000 that equals 3667043360000000

= 3978259050151446
