even, composite, triangular · 28th positive integer
The number 28
28 is an even composite number. It is the 28th positive integer.
Quick reference
| Prime factorization | 2 × 2 × 7 |
| Divisors | 1, 2, 4, 7, 14, 28 |
| Binary | 11100 |
| Hexadecimal | 0x1C |
| Roman numeral | XXVIII |
| Digit sum | 10 |
| Properties | even, composite, triangular |
Reading 28 in NumGrid context
28 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 28 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 28 a prime number?
No. 28 is composite. Its prime factorization is 2 × 2 × 7.
What are the factors of 28?
The factors (divisors) of 28 are 1, 2, 4, 7, 14, 28.
What is 28 in binary?
28 in binary is 11100. In hexadecimal it's 1C.
What is 28 as a Roman numeral?
28 in Roman numerals is XXVIII.
What's the digit sum of 28?
Adding the digits of 28: 2 + 8 = 10.