128923555 has 16 divisors (see below), whose sum is σ = 158895360. Its totient is φ = 100382688.

The previous prime is 128923549. The next prime is 128923567. The reversal of 128923555 is 555329821.

It is a cyclic number.

It is not a de Polignac number, because 128923555 - 2⁵ = 128923523 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28264 + ... + 32506.

It is an arithmetic number, because the mean of its divisors is an integer number (9930960).

Almost surely, 2^128923555 is an apocalyptic number.

128923555 is a deficient number, since it is larger than the sum of its proper divisors (29971805).

128923555 is a wasteful number, since it uses less digits than its factorization.

128923555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410.

The product of its digits is 108000, while the sum is 40.

The square root of 128923555 is about 11354.4508894090. The cubic root of 128923555 is about 505.1776063852.

The spelling of 128923555 in words is "one hundred twenty-eight million, nine hundred twenty-three thousand, five hundred fifty-five".