Alright, let's work through 86843994 times 45690492 step by step
86843994 × 45690492 = 45690492 × (86843994)
+ 45690492 × 4 what gives us 182761968
+ 45690492 × 90 that is equal 4112144280
+ 45690492 × 900 giving us 41121442800
+ 45690492 × 3000 giving us 137071476000
+ 45690492 × 40000 producing 1827619680000
+ 45690492 × 800000 yielding 36552393600000
+ 45690492 × 6000000 yielding 274142952000000
+ 45690492 × 80000000 producing 3655239360000000

= 3967944813105048
