Alright, let's work through 64254721 times 67270947 step by step
64254721 × 67270947 = 67270947 × (64254721)
+ 67270947 × 1 giving us 67270947
+ 67270947 × 20 resulting in 1345418940
+ 67270947 × 700 that results in 47089662900
+ 67270947 × 4000 which equals 269083788000
+ 67270947 × 50000 giving us 3363547350000
+ 67270947 × 200000 producing 13454189400000
+ 67270947 × 4000000 which equals 269083788000000
+ 67270947 × 60000000 what gives us 4036256820000000

= 4322475930890787
