Step 1: Divide the number into separate digits:
39580 => 3 9 5 8 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 9 = 6
9 to 5 = 4
5 to 8 = 3
8 to 0 = 8
0 to 3 = 3
Step 3: Combine the filters to a string:
6 4 3 8 3 = 64383