You can tell if the last 2 digits of the number can be divisible by 4 or 8. So the number 3156372856374856386578365864would be divisible by 8 because 8 can go into 64.
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You can tell if the sum of the digits can be divided by 3.
An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. 50 is an even number.
As close as I can tell so far, it's very close to -1.32 471 795 724 475and may be exactly that.
If the number is divisible by 2 and 3, it can also be divided by 6.For example - 12126 is divisible by 2 and 3 and6Divide it by 6 and see if you get a whole number.
Assuming that 001, 080, etc are not allowed (that is a leading zero or two is not permitted), the smallest number with exactly three digits is 100. The largest number with exactly three digits is 999. So there are 999 - 100 + 1 = 900 numbers with exactly three digits.