228505388 has 12 divisors (see below), whose sum is σ = 400012032. Its totient is φ = 114216240.

The previous prime is 228505379. The next prime is 228505411. The reversal of 228505388 is 883505822.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8981 + ... + 23187.

It is an arithmetic number, because the mean of its divisors is an integer number (33334336).

Almost surely, 2^228505388 is an apocalyptic number.

It is an amenable number.

228505388 is a deficient number, since it is larger than the sum of its proper divisors (171506644).

228505388 is a wasteful number, since it uses less digits than its factorization.

228505388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18232 (or 18230 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 41.

The square root of 228505388 is about 15116.3946759801. The cubic root of 228505388 is about 611.3625263064.

The spelling of 228505388 in words is "two hundred twenty-eight million, five hundred five thousand, three hundred eighty-eight".