Alright, let's work through 8447771 times 77221042 step by step
8447771 × 77221042 = 77221042 × (8447771)
+ 77221042 × 1 yielding 77221042
+ 77221042 × 70 resulting in 5405472940
+ 77221042 × 700 producing 54054729400
+ 77221042 × 7000 which equals 540547294000
+ 77221042 × 40000 that results in 3088841680000
+ 77221042 × 400000 what gives us 30888416800000
+ 77221042 × 8000000 what gives us 617768336000000

= 652345679197382
