28898209 has 2 divisors, whose sum is σ = 28898210. Its totient is φ = 28898208.

The previous prime is 28898179. The next prime is 28898237. The reversal of 28898209 is 90289882.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28037025 + 861184 = 5295^2 + 928^2 .

It is a cyclic number.

It is not a de Polignac number, because 28898209 - 2⁷ = 28898081 is a prime.

It is not a weakly prime, because it can be changed into another prime (28898269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14449104 + 14449105.

It is an arithmetic number, because the mean of its divisors is an integer number (14449105).

Almost surely, 2^28898209 is an apocalyptic number.

It is an amenable number.

28898209 is a deficient number, since it is larger than the sum of its proper divisors (1).

28898209 is an equidigital number, since it uses as much as digits as its factorization.

28898209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 28898209 is about 5375.7054420792. The cubic root of 28898209 is about 306.8717965688.

The spelling of 28898209 in words is "twenty-eight million, eight hundred ninety-eight thousand, two hundred nine".