276643 has 4 divisors (see below), whose sum is σ = 280840. Its totient is φ = 272448.

The previous prime is 276637. The next prime is 276671. The reversal of 276643 is 346672.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-276643 is a prime.

It is a Duffinian number.

276643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (276623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1998 + ... + 2131.

It is an arithmetic number, because the mean of its divisors is an integer number (70210).

2²⁷⁶⁶⁴³ is an apocalyptic number.

276643 is a deficient number, since it is larger than the sum of its proper divisors (4197).

276643 is an equidigital number, since it uses as much as digits as its factorization.

276643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196.

The product of its digits is 6048, while the sum is 28.

The square root of 276643 is about 525.9686302433. The cubic root of 276643 is about 65.1588226580.

It can be divided in two parts, 2766 and 43, that added together give a square (2809 = 53²).

The spelling of 276643 in words is "two hundred seventy-six thousand, six hundred forty-three".