664004789 has 4 divisors (see below), whose sum is σ = 758862624. Its totient is φ = 569146956.

The previous prime is 664004777. The next prime is 664004801. The reversal of 664004789 is 987400466.

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 an interprime number because it is at equal distance from previous prime (664004777) and next prime (664004801).

It is not a de Polignac number, because 664004789 - 2²⁰ = 662956213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664004729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47428907 + ... + 47428920.

It is an arithmetic number, because the mean of its divisors is an integer number (189715656).

Almost surely, 2^664004789 is an apocalyptic number.

It is an amenable number.

664004789 is a deficient number, since it is larger than the sum of its proper divisors (94857835).

664004789 is an equidigital number, since it uses as much as digits as its factorization.

664004789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94857834.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 664004789 is about 25768.2903779044. The cubic root of 664004789 is about 872.4162316711.

The spelling of 664004789 in words is "six hundred sixty-four million, four thousand, seven hundred eighty-nine".