Step 1: Divide the number into separate digits:
82808 => 8 2 8 0 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 2 = 6
2 to 8 = 6
8 to 0 = 8
0 to 8 = 8
8 to 8 = 0
Step 3: Combine the filters to a string:
6 6 8 8 0 = 66880