864073985 has 4 divisors (see below), whose sum is σ = 1036888788. Its totient is φ = 691259184.

The previous prime is 864073961. The next prime is 864073993. The reversal of 864073985 is 589370468.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 668325904 + 195748081 = 25852^2 + 13991^2 .

It is a cyclic number.

It is not a de Polignac number, because 864073985 - 2¹⁰ = 864072961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86407394 + ... + 86407403.

It is an arithmetic number, because the mean of its divisors is an integer number (259222197).

Almost surely, 2^864073985 is an apocalyptic number.

It is an amenable number.

864073985 is a deficient number, since it is larger than the sum of its proper divisors (172814803).

864073985 is a wasteful number, since it uses less digits than its factorization.

864073985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172814802.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 864073985 is about 29395.1353968646. The cubic root of 864073985 is about 952.4678164853.

The spelling of 864073985 in words is "eight hundred sixty-four million, seventy-three thousand, nine hundred eighty-five".