128672879 has 8 divisors (see below), whose sum is σ = 134420352. Its totient is φ = 122938200.

The previous prime is 128672857. The next prime is 128672893. The reversal of 128672879 is 978276821.

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-128672879 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 (128672839) 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, 21512 + ... + 26834.

It is an arithmetic number, because the mean of its divisors is an integer number (16802544).

Almost surely, 2^128672879 is an apocalyptic number.

128672879 is a deficient number, since it is larger than the sum of its proper divisors (5747473).

128672879 is a wasteful number, since it uses less digits than its factorization.

128672879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6397.

The product of its digits is 677376, while the sum is 50.

The square root of 128672879 is about 11343.4068515592. The cubic root of 128672879 is about 504.8499753680.

The spelling of 128672879 in words is "one hundred twenty-eight million, six hundred seventy-two thousand, eight hundred seventy-nine".