864074721 has 4 divisors (see below), whose sum is σ = 1152099632. Its totient is φ = 576049812.

The previous prime is 864074711. The next prime is 864074753. The reversal of 864074721 is 127470468.

864074721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 864074721 - 2¹¹ = 864072673 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 864074721.

It is not an unprimeable number, because it can be changed into a prime (864074711) 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, 144012451 + ... + 144012456.

It is an arithmetic number, because the mean of its divisors is an integer number (288024908).

Almost surely, 2^864074721 is an apocalyptic number.

It is an amenable number.

864074721 is a deficient number, since it is larger than the sum of its proper divisors (288024911).

864074721 is a wasteful number, since it uses less digits than its factorization.

864074721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288024910.

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 864074721 is about 29395.1479159401. The cubic root of 864074721 is about 952.4680869158.

The spelling of 864074721 in words is "eight hundred sixty-four million, seventy-four thousand, seven hundred twenty-one".