Step 1: Divide the number into separate digits:
39733 => 3 9 7 3 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 9 = 6
9 to 7 = 2
7 to 3 = 4
3 to 3 = 0
3 to 3 = 0
Step 3: Combine the filters to a string:
6 2 4 0 0 = 62400