664073923 has 4 divisors (see below), whose sum is σ = 664514928. Its totient is φ = 663632920.

The previous prime is 664073887. The next prime is 664073939. The reversal of 664073923 is 329370466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664073923 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664073323) 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, 218236 + ... + 221257.

It is an arithmetic number, because the mean of its divisors is an integer number (166128732).

Almost surely, 2^664073923 is an apocalyptic number.

664073923 is a deficient number, since it is larger than the sum of its proper divisors (441005).

664073923 is a wasteful number, since it uses less digits than its factorization.

664073923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441004.

The product of its (nonzero) digits is 163296, while the sum is 40.

The square root of 664073923 is about 25769.6317979128. The cubic root of 664073923 is about 872.4465083256.

The spelling of 664073923 in words is "six hundred sixty-four million, seventy-three thousand, nine hundred twenty-three".