679488639 has 4 divisors (see below), whose sum is σ = 905984856. Its totient is φ = 452992424.

The previous prime is 679488637. The next prime is 679488643. The reversal of 679488639 is 936884976.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 679488639 - 2¹ = 679488637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679488637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113248104 + ... + 113248109.

It is an arithmetic number, because the mean of its divisors is an integer number (226496214).

Almost surely, 2^679488639 is an apocalyptic number.

679488639 is a deficient number, since it is larger than the sum of its proper divisors (226496217).

679488639 is a wasteful number, since it uses less digits than its factorization.

679488639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226496216.

The product of its digits is 15676416, while the sum is 60.

The square root of 679488639 is about 26067.0028772009. The cubic root of 679488639 is about 879.1454509958.

The spelling of 679488639 in words is "six hundred seventy-nine million, four hundred eighty-eight thousand, six hundred thirty-nine".