Step 1: Divide the number into separate digits:
48073 => 4 8 0 7 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 8 = 4
8 to 0 = 8
0 to 7 = 7
7 to 3 = 4
3 to 4 = 1
Step 3: Combine the filters to a string:
4 8 7 4 1 = 48741