Alright, let's work through 78775758 times 79379873 step by step
78775758 × 79379873 = 79379873 × (78775758)
+ 79379873 × 8 resulting in 635038984
+ 79379873 × 50 what gives us 3968993650
+ 79379873 × 700 yielding 55565911100
+ 79379873 × 5000 giving us 396899365000
+ 79379873 × 70000 resulting in 5556591110000
+ 79379873 × 700000 resulting in 55565911100000
+ 79379873 × 8000000 yielding 635038984000000
+ 79379873 × 70000000 producing 5556591110000000

= 6253209665518734
