679645865 has 8 divisors (see below), whose sum is σ = 858500160. Its totient is φ = 515099952.

The previous prime is 679645843. The next prime is 679645913. The reversal of 679645865 is 568546976.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 679645865 - 2¹⁶ = 679580329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 679645865.

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 7 ways as a sum of consecutive naturals, for example, 3576989 + ... + 3577178.

It is an arithmetic number, because the mean of its divisors is an integer number (107312520).

Almost surely, 2^679645865 is an apocalyptic number.

It is an amenable number.

679645865 is a deficient number, since it is larger than the sum of its proper divisors (178854295).

679645865 is a wasteful number, since it uses less digits than its factorization.

679645865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7154191.

The product of its digits is 10886400, while the sum is 56.

The square root of 679645865 is about 26070.0185078569. The cubic root of 679645865 is about 879.2132538772.

The spelling of 679645865 in words is "six hundred seventy-nine million, six hundred forty-five thousand, eight hundred sixty-five".