28123204 has 24 divisors (see below), whose sum is σ = 52557120. Its totient is φ = 13135584.

The previous prime is 28123201. The next prime is 28123213. The reversal of 28123204 is 40232182.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 402 + ... + 7510.

It is an arithmetic number, because the mean of its divisors is an integer number (2189880).

Almost surely, 2^28123204 is an apocalyptic number.

It is an amenable number.

28123204 is a deficient number, since it is larger than the sum of its proper divisors (24433916).

28123204 is a wasteful number, since it uses less digits than its factorization.

28123204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7179 (or 7177 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 28123204 is about 5303.1315276919. The cubic root of 28123204 is about 304.1036263758.

Adding to 28123204 its reverse (40232182), we get a palindrome (68355386).

The spelling of 28123204 in words is "twenty-eight million, one hundred twenty-three thousand, two hundred four".