Alright, let's work through 78188320 times 19648274 step by step
78188320 × 19648274 = 19648274 × (78188320)
+ 19648274 × 0 that equals 0
+ 19648274 × 20 that is equal 392965480
+ 19648274 × 300 producing 5894482200
+ 19648274 × 8000 that results in 157186192000
+ 19648274 × 80000 resulting in 1571861920000
+ 19648274 × 100000 resulting in 1964827400000
+ 19648274 × 8000000 giving us 157186192000000
+ 19648274 × 70000000 which equals 1375379180000000

= 1536265534959680
