Alright, let's work through 53823974 times 64542219 step by step
53823974 × 64542219 = 64542219 × (53823974)
+ 64542219 × 4 producing 258168876
+ 64542219 × 70 producing 4517955330
+ 64542219 × 900 producing 58087997100
+ 64542219 × 3000 resulting in 193626657000
+ 64542219 × 20000 what gives us 1290844380000
+ 64542219 × 800000 what gives us 51633775200000
+ 64542219 × 3000000 that results in 193626657000000
+ 64542219 × 50000000 yielding 3227110950000000

= 3473918717358306
