28213227 has 12 divisors (see below), whose sum is σ = 46574320. Its totient is φ = 16121808.

The previous prime is 28213219. The next prime is 28213253. The reversal of 28213227 is 72231282.

It is a happy number.

It is not a de Polignac number, because 28213227 - 2³ = 28213219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28213227.

It is not an unprimeable number, because it can be changed into a prime (28213127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223852 + ... + 223977.

Almost surely, 2^28213227 is an apocalyptic number.

28213227 is a deficient number, since it is larger than the sum of its proper divisors (18361093).

28213227 is a wasteful number, since it uses less digits than its factorization.

28213227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447842 (or 447839 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 28213227 is about 5311.6124670386. The cubic root of 28213227 is about 304.4277615853.

The spelling of 28213227 in words is "twenty-eight million, two hundred thirteen thousand, two hundred twenty-seven".