2688891 has 4 divisors (see below), whose sum is σ = 3585192. Its totient is φ = 1792592.

The previous prime is 2688887. The next prime is 2688913. The reversal of 2688891 is 1988862.

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

It is a cyclic number.

It is not a de Polignac number, because 2688891 - 2² = 2688887 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2688811) 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, 448146 + ... + 448151.

It is an arithmetic number, because the mean of its divisors is an integer number (896298).

2^2688891 is an apocalyptic number.

2688891 is a deficient number, since it is larger than the sum of its proper divisors (896301).

2688891 is an equidigital number, since it uses as much as digits as its factorization.

2688891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896300.

The product of its digits is 55296, while the sum is 42.

The square root of 2688891 is about 1639.7838272163. The cubic root of 2688891 is about 139.0564268947.

The spelling of 2688891 in words is "two million, six hundred eighty-eight thousand, eight hundred ninety-one".