6664889 has 16 divisors (see below), whose sum is σ = 8401536. Its totient is φ = 5136000.

The previous prime is 6664873. The next prime is 6664891. The reversal of 6664889 is 9884666.

It is a cyclic number.

It is not a de Polignac number, because 6664889 - 2⁴ = 6664873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6664859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7349 + ... + 8205.

It is an arithmetic number, because the mean of its divisors is an integer number (525096).

Almost surely, 2^6664889 is an apocalyptic number.

It is an amenable number.

6664889 is a deficient number, since it is larger than the sum of its proper divisors (1736647).

6664889 is a wasteful number, since it uses less digits than its factorization.

6664889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its digits is 497664, while the sum is 47.

The square root of 6664889 is about 2581.6446308507. The cubic root of 6664889 is about 188.1904758053.

It can be divided in two parts, 666 and 4889, that added together give a palindrome (5555).

The spelling of 6664889 in words is "six million, six hundred sixty-four thousand, eight hundred eighty-nine".