Alright, let's work through 79720496 times 86140023 step by step
79720496 × 86140023 = 86140023 × (79720496)
+ 86140023 × 6 resulting in 516840138
+ 86140023 × 90 what gives us 7752602070
+ 86140023 × 400 producing 34456009200
+ 86140023 × 0000 that is equal 0
+ 86140023 × 20000 that equals 1722800460000
+ 86140023 × 700000 resulting in 60298016100000
+ 86140023 × 9000000 yielding 775260207000000
+ 86140023 × 70000000 giving us 6029801610000000

= 6867125359011408
