264321664 has 32 divisors (see below), whose sum is σ = 527742900. Its totient is φ = 131868672.

The previous prime is 264321643. The next prime is 264321667. The reversal of 264321664 is 466123462.

It can be written as a sum of positive squares in 2 ways, for example, as 256256064 + 8065600 = 16008^2 + 2840^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (264321667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63124 + ... + 67180.

Almost surely, 2^264321664 is an apocalyptic number.

It is an amenable number.

264321664 is a deficient number, since it is larger than the sum of its proper divisors (263421236).

264321664 is an equidigital number, since it uses as much as digits as its factorization.

264321664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4580 (or 4568 counting only the distinct ones).

The product of its digits is 41472, while the sum is 34.

The square root of 264321664 is about 16257.9723212952. The cubic root of 264321664 is about 641.7673027594.

The spelling of 264321664 in words is "two hundred sixty-four million, three hundred twenty-one thousand, six hundred sixty-four".