Step 1: Divide the number into separate digits:
32807 => 3 2 8 0 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 2 = 1
2 to 8 = 6
8 to 0 = 8
0 to 7 = 7
7 to 3 = 4
Step 3: Combine the filters to a string:
1 6 8 7 4 = 16874