It is infinite as is the highest whole number because 0 -1 -2 -3 are integers in their own right as used on temperature scales or values given on the Cartesian plane.
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It is 4.
Any negative value and 1.
The smallest factor is 1.
Zero is called the smallest whole number because it is the starting point of the number line. It is less than all positive whole numbers and is considered the lowest value in the set of whole numbers. Additionally, zero is the additive identity, meaning that when added to any number, it does not change the value of that number.
It is replacing the number by the whole number such that the difference between the number and that whole number is the smallest that it can be.