Alright, let's work through 78420343 times 9150602 step by step
78420343 × 9150602 = 9150602 × (78420343)
+ 9150602 × 3 that equals 27451806
+ 9150602 × 40 that equals 366024080
+ 9150602 × 300 what gives us 2745180600
+ 9150602 × 0000 resulting in 0
+ 9150602 × 20000 resulting in 183012040000
+ 9150602 × 400000 resulting in 3660240800000
+ 9150602 × 8000000 producing 73204816000000
+ 9150602 × 70000000 what gives us 640542140000000

= 717593347496486
