128920884 has 12 divisors (see below), whose sum is σ = 300815424. Its totient is φ = 42973624.

The previous prime is 128920801. The next prime is 128920889. The reversal of 128920884 is 488029821.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128920889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5371692 + ... + 5371715.

It is an arithmetic number, because the mean of its divisors is an integer number (25067952).

Almost surely, 2^128920884 is an apocalyptic number.

It is an amenable number.

128920884 is an abundant number, since it is smaller than the sum of its proper divisors (171894540).

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

128920884 is a wasteful number, since it uses less digits than its factorization.

128920884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10743414 (or 10743412 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 128920884 is about 11354.3332697257. Note that the first 3 decimals coincide. The cubic root of 128920884 is about 505.1741176545.

The spelling of 128920884 in words is "one hundred twenty-eight million, nine hundred twenty thousand, eight hundred eighty-four".