864527817 has 4 divisors (see below), whose sum is σ = 1152703760. Its totient is φ = 576351876.

The previous prime is 864527801. The next prime is 864527863. The reversal of 864527817 is 718725468.

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 864527817 - 2⁴ = 864527801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864527897) 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, 144087967 + ... + 144087972.

It is an arithmetic number, because the mean of its divisors is an integer number (288175940).

Almost surely, 2^864527817 is an apocalyptic number.

It is an amenable number.

864527817 is a deficient number, since it is larger than the sum of its proper divisors (288175943).

864527817 is a wasteful number, since it uses less digits than its factorization.

864527817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288175942.

The product of its digits is 752640, while the sum is 48.

The square root of 864527817 is about 29402.8538920969. The cubic root of 864527817 is about 952.6345401401.

The spelling of 864527817 in words is "eight hundred sixty-four million, five hundred twenty-seven thousand, eight hundred seventeen".