Alright, let's work through 85731809 times 81714879 step by step
85731809 × 81714879 = 81714879 × (85731809)
+ 81714879 × 9 yielding 735433911
+ 81714879 × 00 yielding 0
+ 81714879 × 800 giving us 65371903200
+ 81714879 × 1000 giving us 81714879000
+ 81714879 × 30000 that is equal 2451446370000
+ 81714879 × 700000 that results in 57200415300000
+ 81714879 × 5000000 which equals 408574395000000
+ 81714879 × 80000000 producing 6537190320000000

= 7005564398886111
