664723922 has 8 divisors (see below), whose sum is σ = 998141616. Its totient is φ = 332010052.

The previous prime is 664723921. The next prime is 664723937. The reversal of 664723922 is 229327466.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 664723922.

It is not an unprimeable number, because it can be changed into a prime (664723921) 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, 173588 + ... + 177375.

It is an arithmetic number, because the mean of its divisors is an integer number (124767702).

Almost surely, 2^664723922 is an apocalyptic number.

664723922 is a deficient number, since it is larger than the sum of its proper divisors (333417694).

664723922 is a wasteful number, since it uses less digits than its factorization.

664723922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351912.

The product of its digits is 217728, while the sum is 41.

The square root of 664723922 is about 25782.2404379449. The cubic root of 664723922 is about 872.7310672256.

The spelling of 664723922 in words is "six hundred sixty-four million, seven hundred twenty-three thousand, nine hundred twenty-two".