679949977 has 4 divisors (see below), whose sum is σ = 777085696. Its totient is φ = 582814260.

The previous prime is 679949951. The next prime is 679949983. The reversal of 679949977 is 779949976.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 679949977 - 2²³ = 671561369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679949917) 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, 48567849 + ... + 48567862.

It is an arithmetic number, because the mean of its divisors is an integer number (194271424).

Almost surely, 2^679949977 is an apocalyptic number.

It is an amenable number.

679949977 is a deficient number, since it is larger than the sum of its proper divisors (97135719).

679949977 is an equidigital number, since it uses as much as digits as its factorization.

679949977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97135718.

The product of its digits is 54010152, while the sum is 67.

The square root of 679949977 is about 26075.8504559295. The cubic root of 679949977 is about 879.3443709018.

Subtracting 679949977 from its reverse (779949976), we obtain a palindrome (99999999).

The spelling of 679949977 in words is "six hundred seventy-nine million, nine hundred forty-nine thousand, nine hundred seventy-seven".