864643027 has 2 divisors, whose sum is σ = 864643028. Its totient is φ = 864643026.

The previous prime is 864643019. The next prime is 864643037. The reversal of 864643027 is 720346468.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 864643027 - 2³ = 864643019 is a prime.

It is not a weakly prime, because it can be changed into another prime (864643037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432321513 + 432321514.

It is an arithmetic number, because the mean of its divisors is an integer number (432321514).

Almost surely, 2^864643027 is an apocalyptic number.

864643027 is a deficient number, since it is larger than the sum of its proper divisors (1).

864643027 is an equidigital number, since it uses as much as digits as its factorization.

864643027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 864643027 is about 29404.8129903933. The cubic root of 864643027 is about 952.6768553971.

The spelling of 864643027 in words is "eight hundred sixty-four million, six hundred forty-three thousand, twenty-seven".