679927865 has 4 divisors (see below), whose sum is σ = 815913444. Its totient is φ = 543942288.

The previous prime is 679927861. The next prime is 679927891. The reversal of 679927865 is 568729976.

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

It can be written as a sum of positive squares in 2 ways, for example, as 456933376 + 222994489 = 21376^2 + 14933^2 .

It is a cyclic number.

It is not a de Polignac number, because 679927865 - 2² = 679927861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679927861) 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, 67992782 + ... + 67992791.

It is an arithmetic number, because the mean of its divisors is an integer number (203978361).

Almost surely, 2^679927865 is an apocalyptic number.

It is an amenable number.

679927865 is a deficient number, since it is larger than the sum of its proper divisors (135985579).

679927865 is a wasteful number, since it uses less digits than its factorization.

679927865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135985578.

The product of its digits is 11430720, while the sum is 59.

The square root of 679927865 is about 26075.4264586411. The cubic root of 679927865 is about 879.3348386940.

It can be divided in two parts, 67992 and 7865, that added together give a palindrome (75857).

The spelling of 679927865 in words is "six hundred seventy-nine million, nine hundred twenty-seven thousand, eight hundred sixty-five".