Alright, let's work through 3838099 times 90135643 step by step
3838099 × 90135643 = 90135643 × (3838099)
+ 90135643 × 9 that is equal 811220787
+ 90135643 × 90 giving us 8112207870
+ 90135643 × 000 that is equal 0
+ 90135643 × 8000 that is equal 721085144000
+ 90135643 × 30000 which equals 2704069290000
+ 90135643 × 800000 that is equal 72108514400000
+ 90135643 × 3000000 that results in 270406929000000

= 345949521262657
