Step 1: Divide the number into separate digits:
68029 => 6 8 0 2 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 8 = 2
8 to 0 = 8
0 to 2 = 2
2 to 9 = 7
9 to 6 = 3
Step 3: Combine the filters to a string:
2 8 2 7 3 = 28273