28111204 has 27 divisors (see below), whose sum is σ = 54298713.
Its totient is φ = 12724800.
The previous prime is 28111201. The next prime is 28111219. The reversal of 28111204 is 40211182.
Adding to 28111204 its reverse (40211182), we get a palindrome (68322386).
It is a happy number.
The square root of 28111204 is 5302.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 21141604 + 6969600 = 4598^2 + 2640^2
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (28111201) 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 8 ways as a sum of consecutive naturals, for example, 116524 + ... + 116764.
Almost surely, 228111204 is an apocalyptic number.
28111204 is the 5302-nd square number.
It is an amenable number.
28111204 is a deficient number, since it is larger than the sum of its proper divisors (26187509).
28111204 is a wasteful number, since it uses less digits than its factorization.
28111204 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 508 (or 254 counting only the distinct ones).
The product of its (nonzero) digits is 128, while the sum is 19.
The cubic root of 28111204 is about 304.0603671668.
The spelling of 28111204 in words is "twenty-eight million, one hundred eleven thousand, two hundred four".