Step 1: Divide the number into separate digits:
74725 => 7 4 7 2 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 4 = 3
4 to 7 = 3
7 to 2 = 5
2 to 5 = 3
5 to 7 = 2
Step 3: Combine the filters to a string:
3 3 5 3 2 = 33532