128356428 has 24 divisors (see below), whose sum is σ = 299738880. Its totient is φ = 42751120.

The previous prime is 128356421. The next prime is 128356433. The reversal of 128356428 is 824653821.

It is not an unprimeable number, because it can be changed into a prime (128356421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14593 + ... + 21671.

It is an arithmetic number, because the mean of its divisors is an integer number (12489120).

Almost surely, 2^128356428 is an apocalyptic number.

It is an amenable number.

128356428 is an abundant number, since it is smaller than the sum of its proper divisors (171382452).

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

128356428 is a wasteful number, since it uses less digits than its factorization.

128356428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8597 (or 8595 counting only the distinct ones).

The product of its digits is 92160, while the sum is 39.

The square root of 128356428 is about 11329.4495894549. The cubic root of 128356428 is about 504.4357688712.

The spelling of 128356428 in words is "one hundred twenty-eight million, three hundred fifty-six thousand, four hundred twenty-eight".