128811504 has 160 divisors (see below), whose sum is σ = 368101440. Its totient is φ = 38707200.

The previous prime is 128811503. The next prime is 128811509. The reversal of 128811504 is 405118821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128811503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2111634 + ... + 2111694.

It is an arithmetic number, because the mean of its divisors is an integer number (2300634).

Almost surely, 2^128811504 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 128811504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184050720).

128811504 is an abundant number, since it is smaller than the sum of its proper divisors (239289936).

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

128811504 is a wasteful number, since it uses less digits than its factorization.

128811504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 128811504 is about 11349.5155843763. The cubic root of 128811504 is about 505.0312093903.

The spelling of 128811504 in words is "one hundred twenty-eight million, eight hundred eleven thousand, five hundred four".