Alright, let's work through 78689827 times 48610000 step by step
78689827 × 48610000 = 48610000 × (78689827)
+ 48610000 × 7 which equals 340270000
+ 48610000 × 20 producing 972200000
+ 48610000 × 800 producing 38888000000
+ 48610000 × 9000 giving us 437490000000
+ 48610000 × 80000 yielding 3888800000000
+ 48610000 × 600000 yielding 29166000000000
+ 48610000 × 8000000 yielding 388880000000000
+ 48610000 × 70000000 yielding 3402700000000000

= 3825112490470000
