Alright, let's work through 64690742 times 5706290 step by step
64690742 × 5706290 = 5706290 × (64690742)
+ 5706290 × 2 that equals 11412580
+ 5706290 × 40 producing 228251600
+ 5706290 × 700 producing 3994403000
+ 5706290 × 0000 that equals 0
+ 5706290 × 90000 which equals 513566100000
+ 5706290 × 600000 resulting in 3423774000000
+ 5706290 × 4000000 that equals 22825160000000
+ 5706290 × 60000000 which equals 342377400000000

= 369144134167180
