Alright, let's work through 70809725 times 81564713 step by step
70809725 × 81564713 = 81564713 × (70809725)
+ 81564713 × 5 what gives us 407823565
+ 81564713 × 20 giving us 1631294260
+ 81564713 × 700 that results in 57095299100
+ 81564713 × 9000 that results in 734082417000
+ 81564713 × 00000 producing 0
+ 81564713 × 800000 what gives us 65251770400000
+ 81564713 × 0000000 resulting in 0
+ 81564713 × 70000000 what gives us 5709529910000000

= 5775574897233925
