Alright, let's work through 5420307 times 63129856 step by step
5420307 × 63129856 = 63129856 × (5420307)
+ 63129856 × 7 that is equal 441908992
+ 63129856 × 00 that equals 0
+ 63129856 × 300 yielding 18938956800
+ 63129856 × 0000 that results in 0
+ 63129856 × 20000 producing 1262597120000
+ 63129856 × 400000 giving us 25251942400000
+ 63129856 × 5000000 what gives us 315649280000000

= 342183200385792
