679990647 has 8 divisors (see below), whose sum is σ = 1036176256. Its totient is φ = 388566072.

The previous prime is 679990631. The next prime is 679990651. The reversal of 679990647 is 746099976.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 679990647 - 2⁴ = 679990631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679990657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16190233 + ... + 16190274.

It is an arithmetic number, because the mean of its divisors is an integer number (129522032).

Almost surely, 2^679990647 is an apocalyptic number.

679990647 is a deficient number, since it is larger than the sum of its proper divisors (356185609).

679990647 is a wasteful number, since it uses less digits than its factorization.

679990647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32380517.

The product of its (nonzero) digits is 5143824, while the sum is 57.

The square root of 679990647 is about 26076.6302846054. The cubic root of 679990647 is about 879.3619026928.

The spelling of 679990647 in words is "six hundred seventy-nine million, nine hundred ninety thousand, six hundred forty-seven".