128774879 has 4 divisors (see below), whose sum is σ = 128797584. Its totient is φ = 128752176.

The previous prime is 128774801. The next prime is 128774887. The reversal of 128774879 is 978477821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 128774879 - 2⁸ = 128774623 is a prime.

It is a super-2 number, since 2×128774879² = 33165938922929282, which contains 22 as substring.

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 128774879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128774479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5219 + ... + 16875.

It is an arithmetic number, because the mean of its divisors is an integer number (32199396).

Almost surely, 2^128774879 is an apocalyptic number.

128774879 is a deficient number, since it is larger than the sum of its proper divisors (22705).

128774879 is a wasteful number, since it uses less digits than its factorization.

128774879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22704.

The product of its digits is 1580544, while the sum is 53.

The square root of 128774879 is about 11347.9019646805. The cubic root of 128774879 is about 504.9833396458.

The spelling of 128774879 in words is "one hundred twenty-eight million, seven hundred seventy-four thousand, eight hundred seventy-nine".