Divisor 16087

To determine if any number is divisible by 16087, apply the "VliArgm Test":

1. If your number ("X") has 10 digits or more, separate the last (smallest) 9 digits from the rest. This makes two smaller numbers, call them L^eft and R^ight (note: don't add in trailing zeros to L). If there are fewer than 10 digits, L = 0 and therefore R = X.
2. Multiply L by 94 and subtract this from R.
3. Take that result and cross off its final digit (units). Take this new number and subtract 4826 times the digit you just crossed off. Call this final result "Y".
4. Y will be much smaller than X, but we have preserved divisibility by 16087. That is, your original number is divisible by 16087 if (and only if) Y is. Now that it's much smaller, with basic knowledge of your 16087-times tables, it should be easy to visually see if Y is divisible by 16087. If the Y is still much larger than 16087, the above process can be repeated until it does reduce to within small multiples of 16087.

Easy!