864520717 has 4 divisors (see below), whose sum is σ = 864581536. Its totient is φ = 864459900.

The previous prime is 864520693. The next prime is 864520739. The reversal of 864520717 is 717025468.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864520717 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 864520717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864523717) 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, 3568 + ... + 41734.

It is an arithmetic number, because the mean of its divisors is an integer number (216145384).

Almost surely, 2^864520717 is an apocalyptic number.

It is an amenable number.

864520717 is a deficient number, since it is larger than the sum of its proper divisors (60819).

864520717 is a wasteful number, since it uses less digits than its factorization.

864520717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60818.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 864520717 is about 29402.7331552698. The cubic root of 864520717 is about 952.6319322719.

The spelling of 864520717 in words is "eight hundred sixty-four million, five hundred twenty thousand, seven hundred seventeen".