Alright, let's work through 81280087 times 77848036 step by step
81280087 × 77848036 = 77848036 × (81280087)
+ 77848036 × 7 that equals 544936252
+ 77848036 × 80 giving us 6227842880
+ 77848036 × 000 what gives us 0
+ 77848036 × 0000 producing 0
+ 77848036 × 80000 yielding 6227842880000
+ 77848036 × 200000 what gives us 15569607200000
+ 77848036 × 1000000 that equals 77848036000000
+ 77848036 × 80000000 giving us 6227842880000000

= 6327495138859132
