264399985 has 4 divisors (see below), whose sum is σ = 317279988. Its totient is φ = 211519984.

The previous prime is 264399937. The next prime is 264400007. The reversal of 264399985 is 589993462.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 173159281 + 91240704 = 13159^2 + 9552^2 .

It is a cyclic number.

It is not a de Polignac number, because 264399985 - 2¹¹ = 264397937 is a prime.

It is a Duffinian 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, 26439994 + ... + 26440003.

It is an arithmetic number, because the mean of its divisors is an integer number (79319997).

Almost surely, 2^264399985 is an apocalyptic number.

It is an amenable number.

264399985 is a deficient number, since it is larger than the sum of its proper divisors (52880003).

264399985 is an equidigital number, since it uses as much as digits as its factorization.

264399985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52880002.

The product of its digits is 4199040, while the sum is 55.

The square root of 264399985 is about 16260.3808380985. The cubic root of 264399985 is about 641.8306837329.

The spelling of 264399985 in words is "two hundred sixty-four million, three hundred ninety-nine thousand, nine hundred eighty-five".