Alright, let's work through 86712009 times 54875365 step by step
86712009 × 54875365 = 54875365 × (86712009)
+ 54875365 × 9 that is equal 493878285
+ 54875365 × 00 yielding 0
+ 54875365 × 000 that equals 0
+ 54875365 × 2000 producing 109750730000
+ 54875365 × 10000 that equals 548753650000
+ 54875365 × 700000 yielding 38412755500000
+ 54875365 × 6000000 which equals 329252190000000
+ 54875365 × 80000000 producing 4390029200000000

= 4758353143758285
