264520809 has 24 divisors (see below), whose sum is σ = 452845120. Its totient is φ = 151153776.

The previous prime is 264520787. The next prime is 264520811. The reversal of 264520809 is 908025462.

It is a happy number.

264520809 is a `hidden beast` number, since 2 + 645 + 2 + 0 + 8 + 0 + 9 = 666.

It is not a de Polignac number, because 264520809 - 2¹⁶ = 264455273 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264520859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76054 + ... + 79455.

Almost surely, 2^264520809 is an apocalyptic number.

It is an amenable number.

264520809 is a deficient number, since it is larger than the sum of its proper divisors (188324311).

264520809 is an equidigital number, since it uses as much as digits as its factorization.

264520809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155531 (or 155519 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 264520809 is about 16264.0957018827. The cubic root of 264520809 is about 641.9284355551.

The spelling of 264520809 in words is "two hundred sixty-four million, five hundred twenty thousand, eight hundred nine".