Alright, let's work through 78462580 times 65704278 step by step
78462580 × 65704278 = 65704278 × (78462580)
+ 65704278 × 0 which equals 0
+ 65704278 × 80 giving us 5256342240
+ 65704278 × 500 what gives us 32852139000
+ 65704278 × 2000 that is equal 131408556000
+ 65704278 × 60000 which equals 3942256680000
+ 65704278 × 400000 which equals 26281711200000
+ 65704278 × 8000000 resulting in 525634224000000
+ 65704278 × 70000000 that equals 4599299460000000

= 5155327168917240
