2664861 has 4 divisors (see below), whose sum is σ = 3553152. Its totient is φ = 1776572.

The previous prime is 2664859. The next prime is 2664889. The reversal of 2664861 is 1684662.

It is a happy number.

2664861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2664861 - 2¹ = 2664859 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2664811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444141 + ... + 444146.

It is an arithmetic number, because the mean of its divisors is an integer number (888288).

2^2664861 is an apocalyptic number.

It is an amenable number.

2664861 is a deficient number, since it is larger than the sum of its proper divisors (888291).

2664861 is an equidigital number, since it uses as much as digits as its factorization.

2664861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888290.

The product of its digits is 13824, while the sum is 33.

The square root of 2664861 is about 1632.4401979858. The cubic root of 2664861 is about 138.6409483194.

The spelling of 2664861 in words is "two million, six hundred sixty-four thousand, eight hundred sixty-one".