128909228 has 12 divisors (see below), whose sum is σ = 257818512. Its totient is φ = 55246800.

The previous prime is 128909201. The next prime is 128909251. The reversal of 128909228 is 822909821.

128909228 is an admirable number.

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, 2301923 + ... + 2301978.

It is an arithmetic number, because the mean of its divisors is an integer number (21484876).

Almost surely, 2^128909228 is an apocalyptic number.

It is an amenable number.

128909228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128909228 is a wasteful number, since it uses less digits than its factorization.

128909228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4603912 (or 4603910 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 128909228 is about 11353.8199739119. The cubic root of 128909228 is about 505.1588925883.

The spelling of 128909228 in words is "one hundred twenty-eight million, nine hundred nine thousand, two hundred twenty-eight".