Step 1: Divide the number into separate digits:
85390 => 8 5 3 9 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 5 = 3
5 to 3 = 2
3 to 9 = 6
9 to 0 = 9
0 to 8 = 8
Step 3: Combine the filters to a string:
3 2 6 9 8 = 32698