2664891 has 6 divisors (see below), whose sum is σ = 3849300. Its totient is φ = 1776588.

The previous prime is 2664889. The next prime is 2664899. The reversal of 2664891 is 1984662.

2664891 is a `hidden beast` number, since 2 + 6 + 648 + 9 + 1 = 666.

It is not a de Polignac number, because 2664891 - 2¹ = 2664889 is a prime.

2664891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2664899) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148041 + ... + 148058.

It is an arithmetic number, because the mean of its divisors is an integer number (641550).

2^2664891 is an apocalyptic number.

2664891 is a deficient number, since it is larger than the sum of its proper divisors (1184409).

2664891 is a wasteful number, since it uses less digits than its factorization.

2664891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296105 (or 296102 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 2664891 is about 1632.4493866580. The cubic root of 2664891 is about 138.6414685733.

The spelling of 2664891 in words is "two million, six hundred sixty-four thousand, eight hundred ninety-one".