28557227 has 2 divisors, whose sum is σ = 28557228. Its totient is φ = 28557226.

The previous prime is 28557173. The next prime is 28557233. The reversal of 28557227 is 72275582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28557227 - 2⁸ = 28556971 is a prime.

It is not a weakly prime, because it can be changed into another prime (28557427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14278613 + 14278614.

It is an arithmetic number, because the mean of its divisors is an integer number (14278614).

Almost surely, 2^28557227 is an apocalyptic number.

28557227 is a deficient number, since it is larger than the sum of its proper divisors (1).

28557227 is an equidigital number, since it uses as much as digits as its factorization.

28557227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78400, while the sum is 38.

The square root of 28557227 is about 5343.8962377651. The cubic root of 28557227 is about 305.6600486596.

The spelling of 28557227 in words is "twenty-eight million, five hundred fifty-seven thousand, two hundred twenty-seven".