Step 1: Divide the number into separate digits:
57298 => 5 7 2 9 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 7 = 2
7 to 2 = 5
2 to 9 = 7
9 to 8 = 1
8 to 5 = 3
Step 3: Combine the filters to a string:
2 5 7 1 3 = 25713