Alright, let's work through 78515814 times 79925304 step by step
78515814 × 79925304 = 79925304 × (78515814)
+ 79925304 × 4 that is equal 319701216
+ 79925304 × 10 producing 799253040
+ 79925304 × 800 that equals 63940243200
+ 79925304 × 5000 yielding 399626520000
+ 79925304 × 10000 producing 799253040000
+ 79925304 × 500000 that equals 39962652000000
+ 79925304 × 8000000 producing 639402432000000
+ 79925304 × 70000000 that is equal 5594771280000000

= 6275400302757456
