604

604 is the natural number following 603 and preceding 605. It is even and composite, with prime factorization 2^2 × 151. Its divisors are 1, 2, 4, 151, 302, and 604. The sum of its digits is 10, giving a digital root of 1. In various bases, 604 is expressed as 1001011100 in binary and as 0x25C in hexadecimal; in Roman numerals it is DCIV.

604 AD, or Anno Domini 604, is a year in the early medieval period used in historical dating. It falls in the seventh century under the Julian calendar and is used in chronicles that reference events of the time.

Geographically, 604 is the area code for the Metro Vancouver region in British Columbia, Canada. It was one of the original area codes defined in the North American Numbering Plan in 1947 and remains in use today alongside overlay codes.

As a number and a cultural marker, 604 thus appears in mathematics, history, and telecommunications.