Step 1: Divide the number into separate digits:
7627 => 7 6 2 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 6 = 1
6 to 2 = 4
2 to 7 = 5
7 to 7 = 0
Step 3: Combine the filters to a string:
1 4 5 0 = 1450