6664809 has 8 divisors (see below), whose sum is σ = 9192960. Its totient is φ = 4289936.

The previous prime is 6664789. The next prime is 6664811. The reversal of 6664809 is 9084666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6664809 - 2¹⁹ = 6140521 is a prime.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38217 + ... + 38390.

It is an arithmetic number, because the mean of its divisors is an integer number (1149120).

Almost surely, 2^6664809 is an apocalyptic number.

It is an amenable number.

6664809 is a deficient number, since it is larger than the sum of its proper divisors (2528151).

6664809 is a wasteful number, since it uses less digits than its factorization.

6664809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76639.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 6664809 is about 2581.6291368049. The cubic root of 6664809 is about 188.1897228396.

The spelling of 6664809 in words is "six million, six hundred sixty-four thousand, eight hundred nine".