28817889 has 16 divisors (see below), whose sum is σ = 40673280. Its totient is φ = 18098640.

The previous prime is 28817863. The next prime is 28817917. The reversal of 28817889 is 98871882.

It is a happy number.

It is not a de Polignac number, because 28817889 - 2⁹ = 28817377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28817809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9564 + ... + 12210.

It is an arithmetic number, because the mean of its divisors is an integer number (2542080).

Almost surely, 2^28817889 is an apocalyptic number.

It is an amenable number.

28817889 is a deficient number, since it is larger than the sum of its proper divisors (11855391).

28817889 is a wasteful number, since it uses less digits than its factorization.

28817889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860.

The product of its digits is 516096, while the sum is 51.

The square root of 28817889 is about 5368.2295964312. The cubic root of 28817889 is about 306.5872251430.

The spelling of 28817889 in words is "twenty-eight million, eight hundred seventeen thousand, eight hundred eighty-nine".