What is a number

what is anumber?
A number is a arithimatical value which represent the quantity,size ,measurement and etc of any object.
There are different types of numbers.
like as:

1. Natural Number                            {1,2,3,4,5,6,7,8,9,....................}
2. Whole Number                              {0,1,2,3,4,5,6,7,8....................}
3. Integers                                        {......-4,-3,-2,-1,0,+1,+2,+3,+4,.............}