Alright, let's work through 81796477 times 72146807 step by step
81796477 × 72146807 = 72146807 × (81796477)
+ 72146807 × 7 what gives us 505027649
+ 72146807 × 70 which equals 5050276490
+ 72146807 × 400 which equals 28858722800
+ 72146807 × 6000 giving us 432880842000
+ 72146807 × 90000 resulting in 6493212630000
+ 72146807 × 700000 resulting in 50502764900000
+ 72146807 × 1000000 that equals 72146807000000
+ 72146807 × 80000000 producing 5771744560000000

= 5901354639398939
