Step 1: Divide the number into separate digits:
93772 => 9 3 7 7 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 3 = 6
3 to 7 = 4
7 to 7 = 0
7 to 2 = 5
2 to 9 = 7
Step 3: Combine the filters to a string:
6 4 0 5 7 = 64057