128668923 has 24 divisors (see below), whose sum is σ = 195111072. Its totient is φ = 81552768.

The previous prime is 128668913. The next prime is 128668927. The reversal of 128668923 is 329866821.

It is not a de Polignac number, because 128668923 - 2⁸ = 128668667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128668927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34015 + ... + 37607.

It is an arithmetic number, because the mean of its divisors is an integer number (8129628).

Almost surely, 2^128668923 is an apocalyptic number.

128668923 is a deficient number, since it is larger than the sum of its proper divisors (66442149).

128668923 is a wasteful number, since it uses less digits than its factorization.

128668923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3795 (or 3792 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 128668923 is about 11343.2324757981. The cubic root of 128668923 is about 504.8448015065.

The spelling of 128668923 in words is "one hundred twenty-eight million, six hundred sixty-eight thousand, nine hundred twenty-three".