864704721 has 8 divisors (see below), whose sum is σ = 1157043744. Its totient is φ = 574417760.

The previous prime is 864704717. The next prime is 864704741. The reversal of 864704721 is 127407468.

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

It is a cyclic number.

It is not a de Polignac number, because 864704721 - 2² = 864704717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 864704721.

It is not an unprimeable number, because it can be changed into a prime (864704741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512031 + ... + 513716.

It is an arithmetic number, because the mean of its divisors is an integer number (144630468).

Almost surely, 2^864704721 is an apocalyptic number.

It is an amenable number.

864704721 is a deficient number, since it is larger than the sum of its proper divisors (292339023).

864704721 is a wasteful number, since it uses less digits than its factorization.

864704721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026031.

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

The square root of 864704721 is about 29405.8620176318. The cubic root of 864704721 is about 952.6995133211.

The spelling of 864704721 in words is "eight hundred sixty-four million, seven hundred four thousand, seven hundred twenty-one".