Alright, let's work through 81039071 times 79854770 step by step
81039071 × 79854770 = 79854770 × (81039071)
+ 79854770 × 1 producing 79854770
+ 79854770 × 70 yielding 5589833900
+ 79854770 × 000 resulting in 0
+ 79854770 × 9000 yielding 718692930000
+ 79854770 × 30000 resulting in 2395643100000
+ 79854770 × 000000 which equals 0
+ 79854770 × 1000000 producing 79854770000000
+ 79854770 × 80000000 which equals 6388381600000000

= 6471356375718670
