Alright, let's work through 78786153 times 64804814 step by step
78786153 × 64804814 = 64804814 × (78786153)
+ 64804814 × 3 producing 194414442
+ 64804814 × 50 that equals 3240240700
+ 64804814 × 100 yielding 6480481400
+ 64804814 × 6000 that equals 388828884000
+ 64804814 × 80000 producing 5184385120000
+ 64804814 × 700000 which equals 45363369800000
+ 64804814 × 8000000 that results in 518438512000000
+ 64804814 × 70000000 yielding 4536336980000000

= 5105721990940542
