128731679 has 8 divisors (see below), whose sum is σ = 130444800. Its totient is φ = 127030176.

The previous prime is 128731661. The next prime is 128731693. The reversal of 128731679 is 976137821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128731679 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 (128431679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20642 + ... + 26144.

It is an arithmetic number, because the mean of its divisors is an integer number (16305600).

Almost surely, 2^128731679 is an apocalyptic number.

128731679 is a deficient number, since it is larger than the sum of its proper divisors (1713121).

128731679 is a wasteful number, since it uses less digits than its factorization.

128731679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5809.

The product of its digits is 127008, while the sum is 44.

The square root of 128731679 is about 11345.9983694693. The cubic root of 128731679 is about 504.9268645518.

The spelling of 128731679 in words is "one hundred twenty-eight million, seven hundred thirty-one thousand, six hundred seventy-nine".