864643077 has 6 divisors (see below), whose sum is σ = 1248928902. Its totient is φ = 576428712.

The previous prime is 864643061. The next prime is 864643081. The reversal of 864643077 is 770346468.

It can be written as a sum of positive squares in only one way, i.e., 627051681 + 237591396 = 25041^2 + 15414^2 .

It is not a de Polignac number, because 864643077 - 2⁴ = 864643061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864643027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48035718 + ... + 48035735.

It is an arithmetic number, because the mean of its divisors is an integer number (208154817).

Almost surely, 2^864643077 is an apocalyptic number.

It is an amenable number.

864643077 is a deficient number, since it is larger than the sum of its proper divisors (384285825).

864643077 is a wasteful number, since it uses less digits than its factorization.

864643077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96071459 (or 96071456 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The square root of 864643077 is about 29404.8138405942. The cubic root of 864643077 is about 952.6768737607.

The spelling of 864643077 in words is "eight hundred sixty-four million, six hundred forty-three thousand, seventy-seven".