Step 1: Divide the number into separate digits:
50270 => 5 0 2 7 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 0 = 5
0 to 2 = 2
2 to 7 = 5
7 to 0 = 7
0 to 5 = 5
Step 3: Combine the filters to a string:
5 2 5 7 5 = 52575