Step 1: Divide the number into separate digits:
06964 => 0 6 9 6 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 6 = 6
6 to 9 = 3
9 to 6 = 3
6 to 4 = 2
4 to 0 = 4
Step 3: Combine the filters to a string:
6 3 3 2 4 = 63324