28716889 has 4 divisors (see below), whose sum is σ = 28853200. Its totient is φ = 28580580.

The previous prime is 28716841. The next prime is 28716899. The reversal of 28716889 is 98861782.

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 28716889 - 2⁷ = 28716761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28716839) 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, 67839 + ... + 68260.

It is an arithmetic number, because the mean of its divisors is an integer number (7213300).

Almost surely, 2^28716889 is an apocalyptic number.

It is an amenable number.

28716889 is a deficient number, since it is larger than the sum of its proper divisors (136311).

28716889 is a wasteful number, since it uses less digits than its factorization.

28716889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136310.

The product of its digits is 387072, while the sum is 49.

The square root of 28716889 is about 5358.8141412070. The cubic root of 28716889 is about 306.2286335781.

The spelling of 28716889 in words is "twenty-eight million, seven hundred sixteen thousand, eight hundred eighty-nine".