Konichiwa~! My name is Zalgo and I am here to help you out today. The number that you have provided us (0.026890) in Scientific Notation form is "2.6890 × 10^-2".
I hope that this helps! :D
"Stay Brainly and stay proud!" - Zalgo
(By the way, can you mark me as Brainliest? I'd greatly appreciate it! Arigato~! X3)