Alright, let's work through 72597399 times 81913062 step by step
72597399 × 81913062 = 81913062 × (72597399)
+ 81913062 × 9 resulting in 737217558
+ 81913062 × 90 what gives us 7372175580
+ 81913062 × 300 what gives us 24573918600
+ 81913062 × 7000 giving us 573391434000
+ 81913062 × 90000 that is equal 7372175580000
+ 81913062 × 500000 yielding 40956531000000
+ 81913062 × 2000000 that is equal 163826124000000
+ 81913062 × 70000000 giving us 5733914340000000

= 5946675245325738
