Step 1: Divide the number into separate digits:
6289 => 6 2 8 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 2 = 4
2 to 8 = 6
8 to 9 = 1
9 to 6 = 3
Step 3: Combine the filters to a string:
4 6 1 3 = 4613