128521280928 has 24 divisors (see below), whose sum is σ = 337368362688. Its totient is φ = 42840426944.

The previous prime is 128521280827. The next prime is 128521280947. The reversal of 128521280928 is 829082125821.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669381576 + ... + 669381767.

It is an arithmetic number, because the mean of its divisors is an integer number (14057015112).

Almost surely, 2^128521280928 is an apocalyptic number.

It is an amenable number.

128521280928 is an abundant number, since it is smaller than the sum of its proper divisors (208847081760).

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

128521280928 is a wasteful number, since it uses less digits than its factorization.

128521280928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338763356 (or 1338763348 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 48.

The spelling of 128521280928 in words is "one hundred twenty-eight billion, five hundred twenty-one million, two hundred eighty thousand, nine hundred twenty-eight".