28008004 has 12 divisors (see below), whose sum is σ = 50595328. Its totient is φ = 13552200.

The previous prime is 28007981. The next prime is 28008017. The reversal of 28008004 is 40080082.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 112812 + ... + 113059.

Almost surely, 2^28008004 is an apocalyptic number.

It is an amenable number.

28008004 is a deficient number, since it is larger than the sum of its proper divisors (22587324).

28008004 is a wasteful number, since it uses less digits than its factorization.

28008004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225906 (or 225904 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 28008004 is about 5292.2588749985. The cubic root of 28008004 is about 303.6878287859.

Adding to 28008004 its reverse (40080082), we get a palindrome (68088086).

The spelling of 28008004 in words is "twenty-eight million, eight thousand, four".