Alright, let's work through 78777809 times 12478218 step by step
78777809 × 12478218 = 12478218 × (78777809)
+ 12478218 × 9 producing 112303962
+ 12478218 × 00 resulting in 0
+ 12478218 × 800 what gives us 9982574400
+ 12478218 × 7000 what gives us 87347526000
+ 12478218 × 70000 what gives us 873475260000
+ 12478218 × 700000 what gives us 8734752600000
+ 12478218 × 8000000 what gives us 99825744000000
+ 12478218 × 70000000 producing 873475260000000

= 983006674264362
