Step 1: Divide the number into separate digits:
28574 => 2 8 5 7 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
2 to 8 = 6
8 to 5 = 3
5 to 7 = 2
7 to 4 = 3
4 to 2 = 2
Step 3: Combine the filters to a string:
6 3 2 3 2 = 63232