679929977 has 4 divisors (see below), whose sum is σ = 719925876. Its totient is φ = 639934080.

The previous prime is 679929959. The next prime is 679929989. The reversal of 679929977 is 779929976.

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 561642601 + 118287376 = 23699^2 + 10876^2 .

It is a cyclic number.

It is not a de Polignac number, because 679929977 - 2⁸ = 679929721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679929907) 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, 19997924 + ... + 19997957.

It is an arithmetic number, because the mean of its divisors is an integer number (179981469).

Almost surely, 2^679929977 is an apocalyptic number.

It is an amenable number.

679929977 is a deficient number, since it is larger than the sum of its proper divisors (39995899).

679929977 is a wasteful number, since it uses less digits than its factorization.

679929977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39995898.

The product of its digits is 27005076, while the sum is 65.

The square root of 679929977 is about 26075.4669565091. The cubic root of 679929977 is about 879.3357491598.

Subtracting 679929977 from its reverse (779929976), we obtain a palindrome (99999999).

The spelling of 679929977 in words is "six hundred seventy-nine million, nine hundred twenty-nine thousand, nine hundred seventy-seven".