Step 1: Divide the number into separate digits:
70769 => 7 0 7 6 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 0 = 7
0 to 7 = 7
7 to 6 = 1
6 to 9 = 3
9 to 7 = 2
Step 3: Combine the filters to a string:
7 7 1 3 2 = 77132