even, composite · 640th positive integer
The number 640
640 is an even composite number. It is the 640th positive integer.
Quick reference
| Prime factorization | 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 |
| Divisors | 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640 |
| Binary | 1010000000 |
| Hexadecimal | 0x280 |
| Roman numeral | DCXL |
| Digit sum | 10 |
| Properties | even, composite |
Reading 640 in NumGrid context
640 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.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for 640’s peers within positive integers within the NumGrid target pool. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Frequently asked
Is 640 a prime number?
No. 640 is composite. Its prime factorization is 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5.
What are the factors of 640?
The factors (divisors) of 640 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640.
What is 640 in binary?
640 in binary is 1010000000. In hexadecimal it's 280.
What is 640 as a Roman numeral?
640 in Roman numerals is DCXL.
What's the digit sum of 640?
Adding the digits of 640: 6 + 4 + 0 = 10.