Question

This mystery number has four digits. Each digit is an even number. All the digits are different. It is the greatest number that can be described that way. guess this mystery number?
drwls
8642
Kelci
What is the mystery number is greater than 0 and less than 1
samsr
2 5 6
7 1 4
15 21 20
41 14 9
23 42 36