Alright, let's work through 78880792 times 98947569 step by step
78880792 × 98947569 = 98947569 × (78880792)
+ 98947569 × 2 producing 197895138
+ 98947569 × 90 what gives us 8905281210
+ 98947569 × 700 which equals 69263298300
+ 98947569 × 0000 that results in 0
+ 98947569 × 80000 which equals 7915805520000
+ 98947569 × 800000 that results in 79158055200000
+ 98947569 × 8000000 what gives us 791580552000000
+ 98947569 × 70000000 giving us 6926329830000000

= 7805062609194648
