Alright, let's work through 63789920 times 13330912 step by step
63789920 × 13330912 = 13330912 × (63789920)
+ 13330912 × 0 resulting in 0
+ 13330912 × 20 that is equal 266618240
+ 13330912 × 900 which equals 11997820800
+ 13330912 × 9000 which equals 119978208000
+ 13330912 × 80000 which equals 1066472960000
+ 13330912 × 700000 that results in 9331638400000
+ 13330912 × 3000000 resulting in 39992736000000
+ 13330912 × 60000000 that equals 799854720000000

= 850377810007040
