28908227 has 4 divisors (see below), whose sum is σ = 28935816. Its totient is φ = 28880640.

The previous prime is 28908221. The next prime is 28908241. The reversal of 28908227 is 72280982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28908227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28908221) 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, 12158 + ... + 14339.

It is an arithmetic number, because the mean of its divisors is an integer number (7233954).

Almost surely, 2^28908227 is an apocalyptic number.

28908227 is a deficient number, since it is larger than the sum of its proper divisors (27589).

28908227 is a wasteful number, since it uses less digits than its factorization.

28908227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27588.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28908227 is about 5376.6371460235. The cubic root of 28908227 is about 306.9072530508.

The spelling of 28908227 in words is "twenty-eight million, nine hundred eight thousand, two hundred twenty-seven".