Alright, let's work through 63709290 times 50020920 step by step
63709290 × 50020920 = 50020920 × (63709290)
+ 50020920 × 0 yielding 0
+ 50020920 × 90 producing 4501882800
+ 50020920 × 200 that results in 10004184000
+ 50020920 × 9000 that equals 450188280000
+ 50020920 × 00000 producing 0
+ 50020920 × 700000 producing 35014644000000
+ 50020920 × 3000000 yielding 150062760000000
+ 50020920 × 60000000 that results in 3001255200000000

= 3186797298346800
