28665228 has 12 divisors (see below), whose sum is σ = 66885560. Its totient is φ = 9555072.

The previous prime is 28665227. The next prime is 28665233. The reversal of 28665228 is 82256682.

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

It is not an unprimeable number, because it can be changed into a prime (28665223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1194373 + ... + 1194396.

Almost surely, 2^28665228 is an apocalyptic number.

It is an amenable number.

28665228 is an abundant number, since it is smaller than the sum of its proper divisors (38220332).

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

28665228 is a wasteful number, since it uses less digits than its factorization.

28665228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2388776 (or 2388774 counting only the distinct ones).

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

The square root of 28665228 is about 5353.9917818390. The cubic root of 28665228 is about 306.0448906759.

The spelling of 28665228 in words is "twenty-eight million, six hundred sixty-five thousand, two hundred twenty-eight".