28797289 has 4 divisors (see below), whose sum is σ = 28818000. Its totient is φ = 28776580.

The previous prime is 28797283. The next prime is 28797343. The reversal of 28797289 is 98279782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28797289 - 2⁹ = 28796777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28797283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8107 + ... + 11104.

It is an arithmetic number, because the mean of its divisors is an integer number (7204500).

Almost surely, 2^28797289 is an apocalyptic number.

It is an amenable number.

28797289 is a deficient number, since it is larger than the sum of its proper divisors (20711).

28797289 is a wasteful number, since it uses less digits than its factorization.

28797289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20710.

The product of its digits is 1016064, while the sum is 52.

The square root of 28797289 is about 5366.3105575432. The cubic root of 28797289 is about 306.5141547627.

The spelling of 28797289 in words is "twenty-eight million, seven hundred ninety-seven thousand, two hundred eighty-nine".