264688687 has 2 divisors, whose sum is σ = 264688688. Its totient is φ = 264688686.

The previous prime is 264688649. The next prime is 264688703. The reversal of 264688687 is 786886462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 264688687 - 2¹⁹ = 264164399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264682687) 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 as a sum of consecutive naturals, namely, 132344343 + 132344344.

It is an arithmetic number, because the mean of its divisors is an integer number (132344344).

Almost surely, 2^264688687 is an apocalyptic number.

264688687 is a deficient number, since it is larger than the sum of its proper divisors (1).

264688687 is an equidigital number, since it uses as much as digits as its factorization.

264688687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6193152, while the sum is 55.

The square root of 264688687 is about 16269.2558834140. The cubic root of 264688687 is about 642.0642066910.

The spelling of 264688687 in words is "two hundred sixty-four million, six hundred eighty-eight thousand, six hundred eighty-seven".