28881227 has 2 divisors, whose sum is σ = 28881228. Its totient is φ = 28881226.

The previous prime is 28881163. The next prime is 28881239. The reversal of 28881227 is 72218882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28881227 - 2⁶ = 28881163 is a prime.

It is a Chen prime.

It is equal to p_1792766 and since 28881227 and 1792766 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28881247) 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 as a sum of consecutive naturals, namely, 14440613 + 14440614.

It is an arithmetic number, because the mean of its divisors is an integer number (14440614).

Almost surely, 2^28881227 is an apocalyptic number.

28881227 is a deficient number, since it is larger than the sum of its proper divisors (1).

28881227 is an equidigital number, since it uses as much as digits as its factorization.

28881227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28672, while the sum is 38.

The square root of 28881227 is about 5374.1256963342. The cubic root of 28881227 is about 306.8116738349.

The spelling of 28881227 in words is "twenty-eight million, eight hundred eighty-one thousand, two hundred twenty-seven".