28910689 has 2 divisors, whose sum is σ = 28910690. Its totient is φ = 28910688.

The previous prime is 28910677. The next prime is 28910719. The reversal of 28910689 is 98601982.

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., 24830289 + 4080400 = 4983^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 28910689 - 2⁵ = 28910657 is a prime.

It is not a weakly prime, because it can be changed into another prime (28910639) 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, 14455344 + 14455345.

It is an arithmetic number, because the mean of its divisors is an integer number (14455345).

Almost surely, 2^28910689 is an apocalyptic number.

It is an amenable number.

28910689 is a deficient number, since it is larger than the sum of its proper divisors (1).

28910689 is an equidigital number, since it uses as much as digits as its factorization.

28910689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 28910689 is about 5376.8660946689. The cubic root of 28910689 is about 306.9159654981.

The spelling of 28910689 in words is "twenty-eight million, nine hundred ten thousand, six hundred eighty-nine".