28009804 has 6 divisors (see below), whose sum is σ = 49017164. Its totient is φ = 14004900.

The previous prime is 28009801. The next prime is 28009823. The reversal of 28009804 is 40890082.

It is not an unprimeable number, because it can be changed into a prime (28009801) 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 as a sum of consecutive naturals, namely, 3501222 + ... + 3501229.

Almost surely, 2^28009804 is an apocalyptic number.

It is an amenable number.

28009804 is a deficient number, since it is larger than the sum of its proper divisors (21007360).

28009804 is a wasteful number, since it uses less digits than its factorization.

28009804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7002455 (or 7002453 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 28009804 is about 5292.4289319744. The cubic root of 28009804 is about 303.6943343831.

Adding to 28009804 its reverse (40890082), we get a palindrome (68899886).

The spelling of 28009804 in words is "twenty-eight million, nine thousand, eight hundred four".