Step 1: Divide the number into separate digits:
80748 => 8 0 7 4 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 0 = 8
0 to 7 = 7
7 to 4 = 3
4 to 8 = 4
8 to 8 = 0
Step 3: Combine the filters to a string:
8 7 3 4 0 = 87340