664147326 has 8 divisors (see below), whose sum is σ = 1328294664. Its totient is φ = 221382440.

The previous prime is 664147291. The next prime is 664147327. The reversal of 664147326 is 623741466.

It is a happy number.

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

664147326 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664147327) 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, 55345605 + ... + 55345616.

It is an arithmetic number, because the mean of its divisors is an integer number (166036833).

Almost surely, 2^664147326 is an apocalyptic number.

664147326 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664147326 is a wasteful number, since it uses less digits than its factorization.

664147326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110691226.

The product of its digits is 145152, while the sum is 39.

The square root of 664147326 is about 25771.0559737082. The cubic root of 664147326 is about 872.4786522528.

The spelling of 664147326 in words is "six hundred sixty-four million, one hundred forty-seven thousand, three hundred twenty-six".