28058909 has 2 divisors, whose sum is σ = 28058910. Its totient is φ = 28058908.

The previous prime is 28058903. The next prime is 28058923. The reversal of 28058909 is 90985082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21883684 + 6175225 = 4678^2 + 2485^2 .

It is a cyclic number.

It is not a de Polignac number, because 28058909 - 2⁴ = 28058893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28058903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14029454 + 14029455.

It is an arithmetic number, because the mean of its divisors is an integer number (14029455).

Almost surely, 2^28058909 is an apocalyptic number.

It is an amenable number.

28058909 is a deficient number, since it is larger than the sum of its proper divisors (1).

28058909 is an equidigital number, since it uses as much as digits as its factorization.

28058909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 28058909 is about 5297.0660747248. The cubic root of 28058909 is about 303.8717032785.

The spelling of 28058909 in words is "twenty-eight million, fifty-eight thousand, nine hundred nine".