740

740 is a natural number that comes after 739 and before 741. In mathematics, it is an even composite number with prime factorization 2^2 × 5 × 37. Its positive divisors are 1, 2, 4, 5, 10, 20, 37, 74, 148, 185, 370, and 740. The sum of these divisors is 1,596, so the sum of proper divisors equals 856. This makes 740 an abundant number with an abundance of 116.

Representations of 740 vary by numbering system. In Roman numerals it is written as DCCXL. In binary it is 1011100100_2, and in hexadecimal as 0x2E4.

As a calendar year, 740 AD (or 740 CE) appears in historical timelines for various empires of the era, such as the Byzantine Empire and the Chinese Tang dynasty, though the events differ by source. In science and technology, 740 nanometers refers to a wavelength in the near-infrared part of the spectrum, just beyond the visible red, and is used in contexts involving optics and imaging.