28564228 has 36 divisors (see below), whose sum is σ = 62801536. Its totient is φ = 11127600.

The previous prime is 28564219. The next prime is 28564271. The reversal of 28564228 is 82246582.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 828 + ... + 7603.

Almost surely, 2^28564228 is an apocalyptic number.

28564228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28564228 is an abundant number, since it is smaller than the sum of its proper divisors (34237308).

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

28564228 is a wasteful number, since it uses less digits than its factorization.

28564228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8464 (or 8451 counting only the distinct ones).

The product of its digits is 61440, while the sum is 37.

The square root of 28564228 is about 5344.5512440241. The cubic root of 28564228 is about 305.6850248375.

The spelling of 28564228 in words is "twenty-eight million, five hundred sixty-four thousand, two hundred twenty-eight".