2688691 has 4 divisors (see below), whose sum is σ = 2693584. Its totient is φ = 2683800.

The previous prime is 2688667. The next prime is 2688701. The reversal of 2688691 is 1968862.

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 2688691 - 2⁵ = 2688659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2688611) 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, 1500 + ... + 2761.

It is an arithmetic number, because the mean of its divisors is an integer number (673396).

2^2688691 is an apocalyptic number.

2688691 is a deficient number, since it is larger than the sum of its proper divisors (4893).

2688691 is an equidigital number, since it uses as much as digits as its factorization.

2688691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4892.

The product of its digits is 41472, while the sum is 40.

The square root of 2688691 is about 1639.7228424340. The cubic root of 2688691 is about 139.0529791319.

The spelling of 2688691 in words is "two million, six hundred eighty-eight thousand, six hundred ninety-one".