Step 1: Divide the number into separate digits:
27272 => 2 7 2 7 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
2 to 7 = 5
7 to 2 = 5
2 to 7 = 5
7 to 2 = 5
2 to 2 = 0
Step 3: Combine the filters to a string:
5 5 5 5 0 = 55550