28243203 has 4 divisors (see below), whose sum is σ = 37657608. Its totient is φ = 18828800.

The previous prime is 28243181. The next prime is 28243213. The reversal of 28243203 is 30234282.

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 28243203 - 2⁹ = 28242691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28243213) 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, 4707198 + ... + 4707203.

It is an arithmetic number, because the mean of its divisors is an integer number (9414402).

Almost surely, 2^28243203 is an apocalyptic number.

28243203 is a deficient number, since it is larger than the sum of its proper divisors (9414405).

28243203 is an equidigital number, since it uses as much as digits as its factorization.

28243203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9414404.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 28243203 is about 5314.4334599278. The cubic root of 28243203 is about 304.5355395977.

Adding to 28243203 its reverse (30234282), we get a palindrome (58477485).

The spelling of 28243203 in words is "twenty-eight million, two hundred forty-three thousand, two hundred three".