Step 1: Divide the number into separate digits:
75937 => 7 5 9 3 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 5 = 2
5 to 9 = 4
9 to 3 = 6
3 to 7 = 4
7 to 7 = 0
Step 3: Combine the filters to a string:
2 4 6 4 0 = 24640