864197864 has 8 divisors (see below), whose sum is σ = 1620371010. Its totient is φ = 432098928.

The previous prime is 864197857. The next prime is 864197899. The reversal of 864197864 is 468791468.

It can be written as a sum of positive squares in only one way, i.e., 513384964 + 350812900 = 22658^2 + 18730^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54012359 + ... + 54012374.

Almost surely, 2^864197864 is an apocalyptic number.

It is an amenable number.

864197864 is a deficient number, since it is larger than the sum of its proper divisors (756173146).

864197864 is a wasteful number, since it uses less digits than its factorization.

864197864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108024739 (or 108024735 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 53.

The square root of 864197864 is about 29397.2424557134. The cubic root of 864197864 is about 952.5133315393.

The spelling of 864197864 in words is "eight hundred sixty-four million, one hundred ninety-seven thousand, eight hundred sixty-four".