28104203 has 4 divisors (see below), whose sum is σ = 28121040. Its totient is φ = 28087368.

The previous prime is 28104199. The next prime is 28104239. The reversal of 28104203 is 30240182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28104203 - 2² = 28104199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28103203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5600 + ... + 9357.

It is an arithmetic number, because the mean of its divisors is an integer number (7030260).

Almost surely, 2^28104203 is an apocalyptic number.

28104203 is a deficient number, since it is larger than the sum of its proper divisors (16837).

28104203 is a wasteful number, since it uses less digits than its factorization.

28104203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16836.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28104203 is about 5301.3397363308. The cubic root of 28104203 is about 304.0351233368.

Adding to 28104203 its reverse (30240182), we get a palindrome (58344385).

The spelling of 28104203 in words is "twenty-eight million, one hundred four thousand, two hundred three".