Alright, let's work through 63013347 times 63473578 step by step
63013347 × 63473578 = 63473578 × (63013347)
+ 63473578 × 7 that equals 444315046
+ 63473578 × 40 resulting in 2538943120
+ 63473578 × 300 yielding 19042073400
+ 63473578 × 3000 which equals 190420734000
+ 63473578 × 10000 that results in 634735780000
+ 63473578 × 000000 that equals 0
+ 63473578 × 3000000 that results in 190420734000000
+ 63473578 × 60000000 giving us 3808414680000000

= 3999682595845566
