Step 1: Divide the number into separate digits:
69709 => 6 9 7 0 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 9 = 3
9 to 7 = 2
7 to 0 = 7
0 to 9 = 9
9 to 6 = 3
Step 3: Combine the filters to a string:
3 2 7 9 3 = 32793