Step 1: Divide the number into separate digits:
25280 => 2 5 2 8 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
2 to 5 = 3
5 to 2 = 3
2 to 8 = 6
8 to 0 = 8
0 to 2 = 2
Step 3: Combine the filters to a string:
3 3 6 8 2 = 33682