Step 1: Divide the number into separate digits:
49287 => 4 9 2 8 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 9 = 5
9 to 2 = 7
2 to 8 = 6
8 to 7 = 1
7 to 4 = 3
Step 3: Combine the filters to a string:
5 7 6 1 3 = 57613