28081804 has 12 divisors (see below), whose sum is σ = 51279984. Its totient is φ = 13430384.

The previous prime is 28081793. The next prime is 28081811. The reversal of 28081804 is 40818082.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152527 + ... + 152710.

It is an arithmetic number, because the mean of its divisors is an integer number (4273332).

Almost surely, 2^28081804 is an apocalyptic number.

It is an amenable number.

28081804 is a deficient number, since it is larger than the sum of its proper divisors (23198180).

28081804 is a wasteful number, since it uses less digits than its factorization.

28081804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305264 (or 305262 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 28081804 is about 5299.2267360437. The cubic root of 28081804 is about 303.9543300507.

Adding to 28081804 its reverse (40818082), we get a palindrome (68899886).

The spelling of 28081804 in words is "twenty-eight million, eighty-one thousand, eight hundred four".