Step 1: Divide the number into separate digits:
79368 => 7 9 3 6 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 9 = 2
9 to 3 = 6
3 to 6 = 3
6 to 8 = 2
8 to 7 = 1
Step 3: Combine the filters to a string:
2 6 3 2 1 = 26321