Alright, let's work through 15780612 times 39184064 step by step
15780612 × 39184064 = 39184064 × (15780612)
+ 39184064 × 2 producing 78368128
+ 39184064 × 10 producing 391840640
+ 39184064 × 600 giving us 23510438400
+ 39184064 × 0000 giving us 0
+ 39184064 × 80000 that equals 3134725120000
+ 39184064 × 700000 resulting in 27428844800000
+ 39184064 × 5000000 yielding 195920320000000
+ 39184064 × 10000000 producing 391840640000000

= 618348510567168
