128919504 has 80 divisors (see below), whose sum is σ = 389514752. Its totient is φ = 35973504.

The previous prime is 128919493. The next prime is 128919509. The reversal of 128919504 is 405919821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128919509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9987 + ... + 18909.

Almost surely, 2^128919504 is an apocalyptic number.

128919504 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128919504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194757376).

128919504 is an abundant number, since it is smaller than the sum of its proper divisors (260595248).

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

128919504 is a wasteful number, since it uses less digits than its factorization.

128919504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8984 (or 8978 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 128919504 is about 11354.2724998126. The cubic root of 128919504 is about 505.1723151465.

The spelling of 128919504 in words is "one hundred twenty-eight million, nine hundred nineteen thousand, five hundred four".