Step 1: Divide the number into separate digits:
58600 => 5 8 6 0 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 8 = 3
8 to 6 = 2
6 to 0 = 6
0 to 0 = 0
0 to 5 = 5
Step 3: Combine the filters to a string:
3 2 6 0 5 = 32605