Step 1: Divide the number into separate digits:
80847 => 8 0 8 4 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 0 = 8
0 to 8 = 8
8 to 4 = 4
4 to 7 = 3
7 to 8 = 1
Step 3: Combine the filters to a string:
8 8 4 3 1 = 88431