885

885 is an integer that comes after 884 and before 886. It is an odd composite number, with prime factorization 3 × 5 × 59. Because all prime factors are distinct, 885 is squarefree. The sum of its positive divisors is (1+3)(1+5)(1+59) = 4 × 6 × 60 = 1440, which is less than twice the number itself (1770), so 885 is a deficient number in the divisor-function sense.

In base-10 representation, 885 uses the digits 8, 8, and 5. In common numeral forms, it is written in Roman numerals as DCCCLXXXV, and in binary it is 1101110101.

885 nanometers lies in the near-infrared region of the electromagnetic spectrum and is used in some optical and sensing applications, particularly in fiber-optic technology and certain imaging systems.

Historically, the year 885 CE occurred during the early medieval period in Europe and Asia, and is used by historians as a reference point for events of the late 9th century. The year 885 BCE is a separate year in the pre-Classical era.