28904089 has 2 divisors, whose sum is σ = 28904090. Its totient is φ = 28904088.

The previous prime is 28904087. The next prime is 28904093. The reversal of 28904089 is 98040982.

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., 25928464 + 2975625 = 5092^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 28904089 - 2¹ = 28904087 is a prime.

Together with 28904087, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28904081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14452044 + 14452045.

It is an arithmetic number, because the mean of its divisors is an integer number (14452045).

Almost surely, 2^28904089 is an apocalyptic number.

It is an amenable number.

28904089 is a deficient number, since it is larger than the sum of its proper divisors (1).

28904089 is an equidigital number, since it uses as much as digits as its factorization.

28904089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28904089 is about 5376.2523192276. The cubic root of 28904089 is about 306.8926085136.

The spelling of 28904089 in words is "twenty-eight million, nine hundred four thousand, eighty-nine".