even, composite · 128th positive integer
The number 128
128 is an even composite number. It is the 128th positive integer.
Quick reference
| Prime factorization | 2 × 2 × 2 × 2 × 2 × 2 × 2 |
| Divisors | 1, 2, 4, 8, 16, 32, 64, 128 |
| Binary | 10000000 |
| Hexadecimal | 0x80 |
| Roman numeral | CXXVIII |
| Digit sum | 11 |
| Properties | even, composite |
Reading 128 in NumGrid context
128 is one of the data points covered by this site’s integer properties and number-guessing puzzles dataset. The detail above comes directly from classical number theory plus NumGrid solver-derived puzzle statistics; the context that follows situates the headline numbers against the broader distribution across positive integers within the NumGrid target pool.
Every number on this page links back to classical number theory plus NumGrid solver-derived puzzle statistics; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for 128 is typically a peer within positive integers within the NumGrid target pool with similar size, similar exposure, or similar geography — not the national-level summary alone.
Frequently asked
Is 128 a prime number?
No. 128 is composite. Its prime factorization is 2 × 2 × 2 × 2 × 2 × 2 × 2.
What are the factors of 128?
The factors (divisors) of 128 are 1, 2, 4, 8, 16, 32, 64, 128.
What is 128 in binary?
128 in binary is 10000000. In hexadecimal it's 80.
What is 128 as a Roman numeral?
128 in Roman numerals is CXXVIII.
What's the digit sum of 128?
Adding the digits of 128: 1 + 2 + 8 = 11.