Alright, let's work through 86029870 times 83374512 step by step
86029870 × 83374512 = 83374512 × (86029870)
+ 83374512 × 0 producing 0
+ 83374512 × 70 that results in 5836215840
+ 83374512 × 800 that is equal 66699609600
+ 83374512 × 9000 what gives us 750370608000
+ 83374512 × 20000 what gives us 1667490240000
+ 83374512 × 000000 yielding 0
+ 83374512 × 6000000 giving us 500247072000000
+ 83374512 × 80000000 yielding 6669960960000000

= 7172698428673440
