455

455 is the natural number that follows 454 and precedes 456. In mathematics, it is an odd composite number with prime factorization 5 × 7 × 13, and it has eight divisors: 1, 5, 7, 13, 35, 65, 91, and 455. It is a sphenic number, because it is the product of three distinct primes. It also appears as the binomial coefficient 15 choose 3, since 15C3 = 455. In numeral systems, it is written as CDLV in Roman numerals; in binary as 111000111; in octal as 707; and in hexadecimal as 0x1C7.

In science and engineering, 455 kilohertz is a common intermediate frequency used in many superheterodyne AM radio receivers.

In history, the year 455 CE is notable for events in the late Roman Empire, including the assassination of Western Roman Emperor Valentinian III and the sack of Rome by the Vandals led by Genseric.