264575721 has 4 divisors (see below), whose sum is σ = 352767632. Its totient is φ = 176383812.

The previous prime is 264575713. The next prime is 264575723. The reversal of 264575721 is 127575462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 264575721 - 2³ = 264575713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 264575721.

It is not an unprimeable number, because it can be changed into a prime (264575723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44095951 + ... + 44095956.

It is an arithmetic number, because the mean of its divisors is an integer number (88191908).

Almost surely, 2^264575721 is an apocalyptic number.

It is an amenable number.

264575721 is a deficient number, since it is larger than the sum of its proper divisors (88191911).

264575721 is an equidigital number, since it uses as much as digits as its factorization.

264575721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88191910.

The product of its digits is 117600, while the sum is 39.

The square root of 264575721 is about 16265.7837499458. The cubic root of 264575721 is about 641.9728518911.

The spelling of 264575721 in words is "two hundred sixty-four million, five hundred seventy-five thousand, seven hundred twenty-one".