264136865 has 8 divisors (see below), whose sum is σ = 317654568. Its totient is φ = 210849280.

The previous prime is 264136813. The next prime is 264136877. The reversal of 264136865 is 568631462.

It can be written as a sum of positive squares in 4 ways, for example, as 67043344 + 197093521 = 8188^2 + 14039^2 .

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

It is not a de Polignac number, because 264136865 - 2¹² = 264132769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54992 + ... + 59601.

It is an arithmetic number, because the mean of its divisors is an integer number (39706821).

Almost surely, 2^264136865 is an apocalyptic number.

It is an amenable number.

264136865 is a deficient number, since it is larger than the sum of its proper divisors (53517703).

264136865 is a wasteful number, since it uses less digits than its factorization.

264136865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115059.

The product of its digits is 207360, while the sum is 41.

The square root of 264136865 is about 16252.2879927720. The cubic root of 264136865 is about 641.6177052276.

The spelling of 264136865 in words is "two hundred sixty-four million, one hundred thirty-six thousand, eight hundred sixty-five".