28004685 has 16 divisors (see below), whose sum is σ = 46756224. Its totient is φ = 14286272.

The previous prime is 28004663. The next prime is 28004693. The reversal of 28004685 is 58640082.

It is a cyclic number.

It is not a de Polignac number, because 28004685 - 2¹⁵ = 27971917 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 40242 + ... + 40931.

It is an arithmetic number, because the mean of its divisors is an integer number (2922264).

Almost surely, 2^28004685 is an apocalyptic number.

It is an amenable number.

28004685 is a deficient number, since it is larger than the sum of its proper divisors (18751539).

28004685 is a wasteful number, since it uses less digits than its factorization.

28004685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81204.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 28004685 is about 5291.9452945018. The cubic root of 28004685 is about 303.6758324565.

The spelling of 28004685 in words is "twenty-eight million, four thousand, six hundred eighty-five".