2644

2644 is a natural number that follows 2643 and precedes 2645. In mathematics, it is an even composite number. Its prime factorization is 2^2 × 661, where 661 is a prime number. Consequently, 2644 has three prime factors counting multiplicity and is not square-free.

Numerical representations include binary 101001010100, octal 5124, and hexadecimal 0xA54. The sum of its decimal digits is 16, so it is not divisible by 3 or 9. It is divisible by 4, and hence by 2 twice; it is not divisible by 5, 7, or 11.

Beyond pure mathematics, 2644 can denote a calendar year in various eras, such as the year 2644 CE in the Common Era or 2644 BCE in the Before Common Era. As a year, it would lie far in the future or in the distant past, depending on the era used, and any specific historical events would depend on the chosen chronology.

2644 also serves as an identifier in unrelated systems, such as catalog numbers, model identifiers, or sequence labels. In those contexts, its meaning is entirely dependent on the domain and accompanying metadata. Without a defined domain, 2644 remains a numeric label rather than a uniquely defined concept.