Alright, let's work through 80681976 times 62640827 step by step
80681976 × 62640827 = 62640827 × (80681976)
+ 62640827 × 6 giving us 375844962
+ 62640827 × 70 which equals 4384857890
+ 62640827 × 900 giving us 56376744300
+ 62640827 × 1000 that equals 62640827000
+ 62640827 × 80000 that equals 5011266160000
+ 62640827 × 600000 that is equal 37584496200000
+ 62640827 × 0000000 which equals 0
+ 62640827 × 80000000 what gives us 5011266160000000

= 5053985700634152
