28004644 has 12 divisors (see below), whose sum is σ = 51891084. Its totient is φ = 13178624.

The previous prime is 28004629. The next prime is 28004657. The reversal of 28004644 is 44640082.

It can be written as a sum of positive squares in 2 ways, for example, as 15116544 + 12888100 = 3888^2 + 3590^2 .

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 205849 + ... + 205984.

It is an arithmetic number, because the mean of its divisors is an integer number (4324257).

Almost surely, 2^28004644 is an apocalyptic number.

It is an amenable number.

28004644 is a deficient number, since it is larger than the sum of its proper divisors (23886440).

28004644 is a wasteful number, since it uses less digits than its factorization.

28004644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411854 (or 411852 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 28004644 is about 5291.9414206886. The cubic root of 28004644 is about 303.6756842585.

The spelling of 28004644 in words is "twenty-eight million, four thousand, six hundred forty-four".