100,000,000 is the natural number following 99,999,999 and preceding 100,000,001.
In scientific notation, it is written as 10⁸.
East Asian languages treat 100,000,000 as a counting unit, significant as the square of a myriad, also a counting unit. In Chinese, Korean, and Japanese respectively it is yi, eok and oku. These languages do not have single words for a thousand to the second, third, fifth powers, etc.
100,000,000 is also the fourth power of 100 and also the square of 10000.