679565977 has 4 divisors (see below), whose sum is σ = 679989940. Its totient is φ = 679142016.

The previous prime is 679565969. The next prime is 679566001. The reversal of 679565977 is 779565976.

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 443144601 + 236421376 = 21051^2 + 15376^2 .

It is a cyclic number.

It is not a de Polignac number, because 679565977 - 2³ = 679565969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679565917) 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, 209568 + ... + 212785.

It is an arithmetic number, because the mean of its divisors is an integer number (169997485).

Almost surely, 2^679565977 is an apocalyptic number.

It is an amenable number.

679565977 is a deficient number, since it is larger than the sum of its proper divisors (423963).

679565977 is a wasteful number, since it uses less digits than its factorization.

679565977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423962.

The product of its digits is 25004700, while the sum is 61.

The square root of 679565977 is about 26068.4862813321. The cubic root of 679565977 is about 879.1788039064.

Subtracting 679565977 from its reverse (779565976), we obtain a palindrome (99999999).

The spelling of 679565977 in words is "six hundred seventy-nine million, five hundred sixty-five thousand, nine hundred seventy-seven".