28123203 has 4 divisors (see below), whose sum is σ = 37497608. Its totient is φ = 18748800.

The previous prime is 28123201. The next prime is 28123213. The reversal of 28123203 is 30232182.

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

It is not a de Polignac number, because 28123203 - 2¹ = 28123201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28123203.

It is not an unprimeable number, because it can be changed into a prime (28123201) 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, 4687198 + ... + 4687203.

It is an arithmetic number, because the mean of its divisors is an integer number (9374402).

Almost surely, 2^28123203 is an apocalyptic number.

28123203 is a deficient number, since it is larger than the sum of its proper divisors (9374405).

28123203 is an equidigital number, since it uses as much as digits as its factorization.

28123203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9374404.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 28123203 is about 5303.1314334080. The cubic root of 28123203 is about 304.1036227714.

Adding to 28123203 its reverse (30232182), we get a palindrome (58355385).

The spelling of 28123203 in words is "twenty-eight million, one hundred twenty-three thousand, two hundred three".