128827979 has 8 divisors (see below), whose sum is σ = 147376128. Its totient is φ = 110315880.

The previous prime is 128827943. The next prime is 128828003. The reversal of 128827979 is 979728821.

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 a de Polignac number, because none of the positive numbers 2^k-128827979 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 128827979.

It is not an unprimeable number, because it can be changed into a prime (128827939) 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, 857 + ... + 16074.

It is an arithmetic number, because the mean of its divisors is an integer number (18422016).

Almost surely, 2^128827979 is an apocalyptic number.

128827979 is a deficient number, since it is larger than the sum of its proper divisors (18548149).

128827979 is a wasteful number, since it uses less digits than its factorization.

128827979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18025.

The product of its digits is 1016064, while the sum is 53.

The square root of 128827979 is about 11350.2413630724. The cubic root of 128827979 is about 505.0527396476.

The spelling of 128827979 in words is "one hundred twenty-eight million, eight hundred twenty-seven thousand, nine hundred seventy-nine".