What is a 28-digit number?

A 28-digit number is a number that has 28 digits where the first digit must be 1 or greater. On this page, we will answer three questions for you: What is the smallest 28-digit number? What is the largest 28-digit number? How many 28-digit numbers are there?

Smallest 28-digit number
The smallest 28-digit number is 1 followed by 27 zeros. This number is called one octillion.

Largest 28-digit number
The largest 28-digit number is 9 followed by another 27 nines. This number is called nine octillion nine hundred ninety-nine septillion nine hundred ninety-nine sextillion nine hundred ninety-nine quintillion nine hundred ninety-nine quadrillion nine hundred ninety-nine trillion nine hundred ninety-nine billion nine hundred ninety-nine million nine hundred ninety-nine thousand nine hundred ninety-nine.

Total number of 28-digit numbers
There are a total of nine octillion different 28-digit numbers. nine octillion is 9 followed by 27 zeros.

Digit Numbers
Here you can learn about another digit number.

What is a 29-digit number?
Go here for information about the next digit number on our list that we have information about.