Alright, let's work through 64029479 times 21757791 step by step
64029479 × 21757791 = 21757791 × (64029479)
+ 21757791 × 9 yielding 195820119
+ 21757791 × 70 giving us 1523045370
+ 21757791 × 400 what gives us 8703116400
+ 21757791 × 9000 that results in 195820119000
+ 21757791 × 20000 resulting in 435155820000
+ 21757791 × 000000 which equals 0
+ 21757791 × 4000000 that results in 87031164000000
+ 21757791 × 60000000 that results in 1305467460000000

= 1393140021920889
