664894439 has 8 divisors (see below), whose sum is σ = 735276432. Its totient is φ = 596168640.

The previous prime is 664894427. The next prime is 664894453. The reversal of 664894439 is 934498466.

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 664894439 - 2⁸ = 664894183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664894639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413204 + ... + 414809.

It is an arithmetic number, because the mean of its divisors is an integer number (91909554).

Almost surely, 2^664894439 is an apocalyptic number.

664894439 is a deficient number, since it is larger than the sum of its proper divisors (70381993).

664894439 is a wasteful number, since it uses less digits than its factorization.

664894439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828097.

The product of its digits is 4478976, while the sum is 53.

The square root of 664894439 is about 25785.5470952237. The cubic root of 664894439 is about 872.8056860537.

The spelling of 664894439 in words is "six hundred sixty-four million, eight hundred ninety-four thousand, four hundred thirty-nine".