Alright, let's work through 81074273 times 80387086 step by step
81074273 × 80387086 = 80387086 × (81074273)
+ 80387086 × 3 resulting in 241161258
+ 80387086 × 70 that results in 5627096020
+ 80387086 × 200 that is equal 16077417200
+ 80387086 × 4000 producing 321548344000
+ 80387086 × 70000 that results in 5627096020000
+ 80387086 × 000000 that equals 0
+ 80387086 × 1000000 what gives us 80387086000000
+ 80387086 × 80000000 which equals 6430966880000000

= 6517324556038478
