An eight-digit number is a numerical value that consists of exactly eight digits, ranging from 0 to 9. These numbers can represent various things, such as population counts, financial figures, or identification codes. For example, the number 12345678 is an eight-digit number, while 12345 is not because it only has five digits. In mathematics, eight-digit numbers can be classified as whole numbers and can be used in calculations like addition, subtraction, multiplication, and division. They can also be found in everyday life, such as in bank account numbers or phone numbers, where a specific format is often required.