228521128 has 32 divisors (see below), whose sum is σ = 475103520. Its totient is φ = 102168000.

The previous prime is 228521099. The next prime is 228521129. The reversal of 228521128 is 821125822.

It is a self number, because there is not a number n which added to its sum of digits gives 228521128.

It is not an unprimeable number, because it can be changed into a prime (228521129) 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, 15918 + ... + 26653.

It is an arithmetic number, because the mean of its divisors is an integer number (14846985).

Almost surely, 2^228521128 is an apocalyptic number.

It is an amenable number.

228521128 is an abundant number, since it is smaller than the sum of its proper divisors (246582392).

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

228521128 is a wasteful number, since it uses less digits than its factorization.

228521128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42649 (or 42645 counting only the distinct ones).

The product of its digits is 5120, while the sum is 31.

The square root of 228521128 is about 15116.9152938025. The cubic root of 228521128 is about 611.3765633572.

The spelling of 228521128 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, one hundred twenty-eight".