Step 1: Divide the number into separate digits:
87287 => 8 7 2 8 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 7 = 1
7 to 2 = 5
2 to 8 = 6
8 to 7 = 1
7 to 8 = 1
Step 3: Combine the filters to a string:
1 5 6 1 1 = 15611