28864817 has 2 divisors, whose sum is σ = 28864818. Its totient is φ = 28864816.

The previous prime is 28864789. The next prime is 28864841. The reversal of 28864817 is 71846882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28344976 + 519841 = 5324^2 + 721^2 .

It is a cyclic number.

It is not a de Polignac number, because 28864817 - 2⁶ = 28864753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28864867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14432408 + 14432409.

It is an arithmetic number, because the mean of its divisors is an integer number (14432409).

Almost surely, 2^28864817 is an apocalyptic number.

It is an amenable number.

28864817 is a deficient number, since it is larger than the sum of its proper divisors (1).

28864817 is an equidigital number, since it uses as much as digits as its factorization.

28864817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 44.

The square root of 28864817 is about 5372.5987194281. The cubic root of 28864817 is about 306.7535538038.

The spelling of 28864817 in words is "twenty-eight million, eight hundred sixty-four thousand, eight hundred seventeen".