128904 has 32 divisors (see below), whose sum is σ = 332640. Its totient is φ = 41600.

The previous prime is 128903. The next prime is 128923. The reversal of 128904 is 409821.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (128903) 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, 919 + ... + 1049.

It is an arithmetic number, because the mean of its divisors is an integer number (10395).

2¹²⁸⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166320).

128904 is an abundant number, since it is smaller than the sum of its proper divisors (203736).

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

128904 is a wasteful number, since it uses less digits than its factorization.

128904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 128904 is about 359.0320319971. The cubic root of 128904 is about 50.5152063477.

The spelling of 128904 in words is "one hundred twenty-eight thousand, nine hundred four".