28881089 has 2 divisors, whose sum is σ = 28881090. Its totient is φ = 28881088.

The previous prime is 28881067. The next prime is 28881101. The reversal of 28881089 is 98018882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26214400 + 2666689 = 5120^2 + 1633^2 .

It is a cyclic number.

It is not a de Polignac number, because 28881089 - 2²⁴ = 12103873 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28881059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14440544 + 14440545.

It is an arithmetic number, because the mean of its divisors is an integer number (14440545).

Almost surely, 2^28881089 is an apocalyptic number.

It is an amenable number.

28881089 is a deficient number, since it is larger than the sum of its proper divisors (1).

28881089 is an equidigital number, since it uses as much as digits as its factorization.

28881089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 44.

The square root of 28881089 is about 5374.1128570211. The cubic root of 28881089 is about 306.8111851660.

The spelling of 28881089 in words is "twenty-eight million, eight hundred eighty-one thousand, eighty-nine".