2779

2779 is a natural number that follows 2778 and precedes 2780. In mathematics, it is a semiprime, being the product of two primes: 2779 = 7 × 397, with 7 and 397 both prime. Its divisors are 1, 7, 397, and 2779. The number is odd and not a multiple of 3 or 5. The totient φ(2779) equals 2376.

In different numeral systems, 2779 is represented as 101011011011 in binary, 5333 in octal, and 0xADB in hexadecimal. In Roman numerals it is written as MMDCCLXXIX.

As a calendar year, 2779 AD would be in the far future relative to the present era. No major historical events are associated with this year in standard reference sources; it may be used in fictional or speculative contexts.