618

618 is a positive integer that follows 617 and precedes 619. In decimal notation it is written as 618.

In number theory, 618 factors as 2 × 3 × 103. It is a square-free composite number with three distinct prime factors. The sum of its digits is 15, which does not divide 618, so 618 is not a Harshad number.

618 AD is a significant year in Chinese history, marking the traditional founding of the Tang dynasty after the collapse of the Sui dynasty. Li Yuan, who became Emperor Gaozu, established the Tang in 618, with the capital at Chang’an (modern Xi’an). This year is commonly cited as the start of the Tang era, an important period in Chinese culture and governance.

618 is also the name of a major mid-year online shopping festival in China, commonly associated with JD.com. The event is held on June 18 and has been adopted by various e-commerce platforms as a large-scale promotional period, comparable in cultural prominence to other large shopping events such as Singles’ Day in November. The festival has influenced online retail promotion strategies and consumer behavior in the Chinese market.