864643076 has 12 divisors (see below), whose sum is σ = 1650682320. Its totient is φ = 393019560.

The previous prime is 864643061. The next prime is 864643081. The reversal of 864643076 is 670346468.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 19650979 = 864643076 / (8 + 6 + 4 + 6 + 4 + 3 + 0 + 7 + 6).

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, 9825446 + ... + 9825533.

It is an arithmetic number, because the mean of its divisors is an integer number (137556860).

Almost surely, 2^864643076 is an apocalyptic number.

It is an amenable number.

864643076 is a deficient number, since it is larger than the sum of its proper divisors (786039244).

864643076 is a wasteful number, since it uses less digits than its factorization.

864643076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19650994 (or 19650992 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 44.

The square root of 864643076 is about 29404.8138235902. The cubic root of 864643076 is about 952.6768733934.

The spelling of 864643076 in words is "eight hundred sixty-four million, six hundred forty-three thousand, seventy-six".