264238638 has 8 divisors (see below), whose sum is σ = 528477288. Its totient is φ = 88079544.

The previous prime is 264238621. The next prime is 264238649. The reversal of 264238638 is 836832462.

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

264238638 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 264238638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22019881 + ... + 22019892.

It is an arithmetic number, because the mean of its divisors is an integer number (66059661).

Almost surely, 2^264238638 is an apocalyptic number.

264238638 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.

264238638 is a wasteful number, since it uses less digits than its factorization.

264238638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44039778.

The product of its digits is 331776, while the sum is 42.

The square root of 264238638 is about 16255.4187273044. The cubic root of 264238638 is about 641.7001006098.

The spelling of 264238638 in words is "two hundred sixty-four million, two hundred thirty-eight thousand, six hundred thirty-eight".