128918879 has 8 divisors (see below), whose sum is σ = 130035360. Its totient is φ = 127807200.

The previous prime is 128918861. The next prime is 128918893. The reversal of 128918879 is 978819821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 128918879 - 2¹⁶ = 128853343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128918879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128918849) 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, 69494 + ... + 71324.

It is an arithmetic number, because the mean of its divisors is an integer number (16254420).

Almost surely, 2^128918879 is an apocalyptic number.

128918879 is a deficient number, since it is larger than the sum of its proper divisors (1116481).

128918879 is a wasteful number, since it uses less digits than its factorization.

128918879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401.

The product of its digits is 580608, while the sum is 53.

The square root of 128918879 is about 11354.2449771000. The cubic root of 128918879 is about 505.1714987890.

The spelling of 128918879 in words is "one hundred twenty-eight million, nine hundred eighteen thousand, eight hundred seventy-nine".