679686977 has 4 divisors (see below), whose sum is σ = 685702020. Its totient is φ = 673671936.

The previous prime is 679686967. The next prime is 679686989. The reversal of 679686977 is 779686976.

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 194630401 + 485056576 = 13951^2 + 22024^2 .

It is a cyclic number.

It is not a de Polignac number, because 679686977 - 2⁶ = 679686913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679686947) by changing a digit.

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, 3007352 + ... + 3007577.

It is an arithmetic number, because the mean of its divisors is an integer number (171425505).

Almost surely, 2^679686977 is an apocalyptic number.

It is an amenable number.

679686977 is a deficient number, since it is larger than the sum of its proper divisors (6015043).

679686977 is a wasteful number, since it uses less digits than its factorization.

679686977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6015042.

The product of its digits is 48009024, while the sum is 65.

The square root of 679686977 is about 26070.8069878936. The cubic root of 679686977 is about 879.2309814853.

Subtracting 679686977 from its reverse (779686976), we obtain a palindrome (99999999).

The spelling of 679686977 in words is "six hundred seventy-nine million, six hundred eighty-six thousand, nine hundred seventy-seven".