Step 1: Divide the number into separate digits:
77281 => 7 7 2 8 1
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 7 = 0
7 to 2 = 5
2 to 8 = 6
8 to 1 = 7
1 to 7 = 6
Step 3: Combine the filters to a string:
0 5 6 7 6 = 05676