Step 1: Divide the number into separate digits:
02928 => 0 2 9 2 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 2 = 2
2 to 9 = 7
9 to 2 = 7
2 to 8 = 6
8 to 0 = 8
Step 3: Combine the filters to a string:
2 7 7 6 8 = 27768