Alright, let's work through 78681370 times 79809081 step by step
78681370 × 79809081 = 79809081 × (78681370)
+ 79809081 × 0 that is equal 0
+ 79809081 × 70 that results in 5586635670
+ 79809081 × 300 what gives us 23942724300
+ 79809081 × 1000 what gives us 79809081000
+ 79809081 × 80000 giving us 6384726480000
+ 79809081 × 600000 that results in 47885448600000
+ 79809081 × 8000000 yielding 638472648000000
+ 79809081 × 70000000 what gives us 5586635670000000

= 6279487831520970
