28245289 has 2 divisors, whose sum is σ = 28245290. Its totient is φ = 28245288.

The previous prime is 28245263. The next prime is 28245293. The reversal of 28245289 is 98254282.

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., 22992025 + 5253264 = 4795^2 + 2292^2 .

It is a cyclic number.

It is not a de Polignac number, because 28245289 - 2¹⁵ = 28212521 is a prime.

It is not a weakly prime, because it can be changed into another prime (28245299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14122644 + 14122645.

It is an arithmetic number, because the mean of its divisors is an integer number (14122645).

Almost surely, 2^28245289 is an apocalyptic number.

It is an amenable number.

28245289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28245289 is an equidigital number, since it uses as much as digits as its factorization.

28245289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 40.

The square root of 28245289 is about 5314.6297142887. The cubic root of 28245289 is about 304.5430369236.

The spelling of 28245289 in words is "twenty-eight million, two hundred forty-five thousand, two hundred eighty-nine".