28404304 has 10 divisors (see below), whose sum is σ = 55033370. Its totient is φ = 14202144.

The previous prime is 28404293. The next prime is 28404307. The reversal of 28404304 is 40340482.

It can be written as a sum of positive squares in only one way, i.e., 19713600 + 8690704 = 4440^2 + 2948^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28404307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 887619 + ... + 887650.

It is an arithmetic number, because the mean of its divisors is an integer number (5503337).

Almost surely, 2^28404304 is an apocalyptic number.

It is an amenable number.

28404304 is a deficient number, since it is larger than the sum of its proper divisors (26629066).

28404304 is a wasteful number, since it uses less digits than its factorization.

28404304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775277 (or 1775271 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 28404304 is about 5329.5688380956. The cubic root of 28404304 is about 305.1134720669.

Adding to 28404304 its reverse (40340482), we get a palindrome (68744786).

The spelling of 28404304 in words is "twenty-eight million, four hundred four thousand, three hundred four".