128658678 has 16 divisors (see below), whose sum is σ = 259170240. Its totient is φ = 42577416.

The previous prime is 128658661. The next prime is 128658679. The reversal of 128658678 is 876856821.

It is a self number, because there is not a number n which added to its sum of digits gives 128658678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128658679) 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, 76300 + ... + 77967.

It is an arithmetic number, because the mean of its divisors is an integer number (16198140).

Almost surely, 2^128658678 is an apocalyptic number.

128658678 is an abundant number, since it is smaller than the sum of its proper divisors (130511562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128658678 is a wasteful number, since it uses less digits than its factorization.

128658678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154411.

The product of its digits is 1290240, while the sum is 51.

The square root of 128658678 is about 11342.7808759581. The cubic root of 128658678 is about 504.8314020724.

The spelling of 128658678 in words is "one hundred twenty-eight million, six hundred fifty-eight thousand, six hundred seventy-eight".