890

890 is a natural number that follows 889 and precedes 891. In mathematics it is an even, composite integer commonly used to illustrate base representations and factorization.

The prime factorization of 890 is 2 × 5 × 89. Its positive divisors are 1, 2, 5, 10, 89, 178, 445, and 890. The sum of its proper divisors is 730, which means 890 is a deficient number (the sum of its proper divisors is less than the number itself). In various numeral systems, 890 can be represented as 1101111010 in binary, 1572 in octal, and 0x37A in hexadecimal. In Roman numerals, 890 is written as DCCCXC.

In calendar and notation contexts, 890 can refer to the calendar year 890 CE or 890 BCE, depending on era designation. As a catalog, serial, or model number, it appears across different domains, but such uses vary by organization and are not tied to a single universal meaning.

Related facts include the observation that 89 is a Fibonacci number and is prime; since 890 = 10 × 89, the Fibonacci connection appears indirectly through its factorization. The number’s ending in zero reflects its divisibility by 10, arising from the factors 2 and 5.

Overall, 890 is a moderately composite integer notable for its factorization, its representations in multiple bases, and its place in basic number theory as a deficient number.