Step 1: Divide the number into separate digits:
28892 => 2 8 8 9 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
2 to 8 = 6
8 to 8 = 0
8 to 9 = 1
9 to 2 = 7
2 to 2 = 0
Step 3: Combine the filters to a string:
6 0 1 7 0 = 60170