Alright, let's work through 79783728 times 8109753 step by step
79783728 × 8109753 = 8109753 × (79783728)
+ 8109753 × 8 which equals 64878024
+ 8109753 × 20 giving us 162195060
+ 8109753 × 700 yielding 5676827100
+ 8109753 × 3000 producing 24329259000
+ 8109753 × 80000 what gives us 648780240000
+ 8109753 × 700000 resulting in 5676827100000
+ 8109753 × 9000000 that results in 72987777000000
+ 8109753 × 70000000 that results in 567682710000000

= 647026327499184
