Step 1: Divide the number into separate digits:
59607 => 5 9 6 0 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 9 = 4
9 to 6 = 3
6 to 0 = 6
0 to 7 = 7
7 to 5 = 2
Step 3: Combine the filters to a string:
4 3 6 7 2 = 43672