28368389 has 4 divisors (see below), whose sum is σ = 32421024. Its totient is φ = 24315756.

The previous prime is 28368343. The next prime is 28368419. The reversal of 28368389 is 98386382.

It is a happy number.

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 28368389 - 2⁸ = 28368133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28368889) 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, 2026307 + ... + 2026320.

It is an arithmetic number, because the mean of its divisors is an integer number (8105256).

Almost surely, 2^28368389 is an apocalyptic number.

It is an amenable number.

28368389 is a deficient number, since it is larger than the sum of its proper divisors (4052635).

28368389 is an equidigital number, since it uses as much as digits as its factorization.

28368389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052634.

The product of its digits is 497664, while the sum is 47.

The square root of 28368389 is about 5326.1983628100. The cubic root of 28368389 is about 304.9848205292.

The spelling of 28368389 in words is "twenty-eight million, three hundred sixty-eight thousand, three hundred eighty-nine".