Alright, let's work through 78216877 times 75335569 step by step
78216877 × 75335569 = 75335569 × (78216877)
+ 75335569 × 7 resulting in 527348983
+ 75335569 × 70 resulting in 5273489830
+ 75335569 × 800 producing 60268455200
+ 75335569 × 6000 producing 452013414000
+ 75335569 × 10000 that results in 753355690000
+ 75335569 × 200000 giving us 15067113800000
+ 75335569 × 8000000 resulting in 602684552000000
+ 75335569 × 70000000 yielding 5273489830000000

= 5892512934198013
