Seventynine

Seventynine primarily refers to the decimal integer 79, which in standard English is written as seventy-nine. The continuous form seventynine is uncommon in formal writing and is typically seen only in stylized branding, domain names, or titles.

In mathematics, seventynine is a prime number. It is the 22nd prime, is odd, and has no positive divisors other than 1 and itself. Its digit sum is 16. In different numeral systems, 79 is represented as 1001111 in binary, and 0x4F in hexadecimal. In Roman numerals, it is written as LXXIX. In the ASCII character set, the decimal code 79 corresponds to the capital letter O.

Historically, the year 79 CE is notable for the eruption of Mount Vesuvius, which led to the destruction of Pompeii and Herculaneum and is a well-known event from ancient Roman history.

Seventynine is also used in everyday contexts as part of dates, ages, measurements, or identifiers. The standard English spelling for the number is seventy-nine, with hyphenation between the two parts when written as a word. The form seventynine, without a hyphen, may appear in branding, product names, or stylized text, but is not considered standard in formal usage.

Overall, seventynine denotes a specific, well-defined integer with clear mathematical properties, while the unspaced form seventynine is largely a stylistic or contextual variant.