478

478 is an integer that follows 477 and precedes 479. It is an even, composite number, with prime factorization 2 × 239, where 239 is prime. In various numeral systems, 478 is represented as 111011110 in binary, 0x1DE in hexadecimal, and 0o736 in octal. In Roman numerals, 478 is CDLXXVIII.

In science and measurement, a wavelength of 478 nanometers lies in the blue portion of the visible spectrum and is used in fields such as spectroscopy and lighting research.

As a calendar year, 478 AD falls in the late ancient period, a time characterized by the continuing transition from the late Western Roman Empire to the early Byzantine era. The year 478 BCE belongs to classical antiquity and is a point in the broader chronology of ancient Greece and the surrounding regions.

Overall, 478 is principally notable as a composite number with simple factorization and as a unit used in various numeral representations, as well as a reference in measurements and historical dating.