864681679 has 4 divisors (see below), whose sum is σ = 867759120. Its totient is φ = 861604240.

The previous prime is 864681673. The next prime is 864681691. The reversal of 864681679 is 976186468.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 864681679 - 2⁷ = 864681551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864681673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538299 + ... + 1538860.

It is an arithmetic number, because the mean of its divisors is an integer number (216939780).

Almost surely, 2^864681679 is an apocalyptic number.

864681679 is a deficient number, since it is larger than the sum of its proper divisors (3077441).

864681679 is a wasteful number, since it uses less digits than its factorization.

864681679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077440.

The product of its digits is 3483648, while the sum is 55.

The square root of 864681679 is about 29405.4702223923. The cubic root of 864681679 is about 952.6910509730.

The spelling of 864681679 in words is "eight hundred sixty-four million, six hundred eighty-one thousand, six hundred seventy-nine".