Alright, let's work through 28669159 times 64002821 step by step
28669159 × 64002821 = 64002821 × (28669159)
+ 64002821 × 9 what gives us 576025389
+ 64002821 × 50 yielding 3200141050
+ 64002821 × 100 resulting in 6400282100
+ 64002821 × 9000 that equals 576025389000
+ 64002821 × 60000 what gives us 3840169260000
+ 64002821 × 600000 that equals 38401692600000
+ 64002821 × 8000000 producing 512022568000000
+ 64002821 × 20000000 that is equal 1280056420000000

= 1834907051697539
