128508864 has 112 divisors (see below), whose sum is σ = 376586496. Its totient is φ = 38348800.

The previous prime is 128508839. The next prime is 128508869. The reversal of 128508864 is 468805821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128508869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149524 + ... + 150380.

Almost surely, 2^128508864 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 128508864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188293248).

128508864 is an abundant number, since it is smaller than the sum of its proper divisors (248077632).

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

128508864 is a wasteful number, since it uses less digits than its factorization.

128508864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954 (or 944 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 128508864 is about 11336.1750162919. The cubic root of 128508864 is about 504.6353790564.

The spelling of 128508864 in words is "one hundred twenty-eight million, five hundred eight thousand, eight hundred sixty-four".