28816404 has 12 divisors (see below), whose sum is σ = 67238304. Its totient is φ = 9605464.

The previous prime is 28816397. The next prime is 28816409. The reversal of 28816404 is 40461882.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28816409) 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 3 ways as a sum of consecutive naturals, for example, 1200672 + ... + 1200695.

It is an arithmetic number, because the mean of its divisors is an integer number (5603192).

Almost surely, 2^28816404 is an apocalyptic number.

It is an amenable number.

28816404 is an abundant number, since it is smaller than the sum of its proper divisors (38421900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28816404 is a wasteful number, since it uses less digits than its factorization.

28816404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401374 (or 2401372 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 28816404 is about 5368.0912808931. The cubic root of 28816404 is about 306.5819588557.

The spelling of 28816404 in words is "twenty-eight million, eight hundred sixteen thousand, four hundred four".