864665749 has 8 divisors (see below), whose sum is σ = 905523840. Its totient is φ = 824079696.

The previous prime is 864665731. The next prime is 864665759. The reversal of 864665749 is 947566468.

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

It is not a de Polignac number, because 864665749 - 2⁷ = 864665621 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 864665749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864665719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61489 + ... + 74230.

It is an arithmetic number, because the mean of its divisors is an integer number (113190480).

Almost surely, 2^864665749 is an apocalyptic number.

It is an amenable number.

864665749 is a deficient number, since it is larger than the sum of its proper divisors (40858091).

864665749 is a wasteful number, since it uses less digits than its factorization.

864665749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136019.

The product of its digits is 8709120, while the sum is 55.

The square root of 864665749 is about 29405.1993531756. The cubic root of 864665749 is about 952.6852004725.

The spelling of 864665749 in words is "eight hundred sixty-four million, six hundred sixty-five thousand, seven hundred forty-nine".