Step 1: Divide the number into separate digits:
26747 => 2 6 7 4 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
2 to 6 = 4
6 to 7 = 1
7 to 4 = 3
4 to 7 = 3
7 to 2 = 5
Step 3: Combine the filters to a string:
4 1 3 3 5 = 41335