28704805 has 8 divisors (see below), whose sum is σ = 35943552. Its totient is φ = 21965328.

The previous prime is 28704799. The next prime is 28704811. The reversal of 28704805 is 50840782.

It is an interprime number because it is at equal distance from previous prime (28704799) and next prime (28704811).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28704805 - 2⁷ = 28704677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124689 + ... + 124918.

It is an arithmetic number, because the mean of its divisors is an integer number (4492944).

Almost surely, 2^28704805 is an apocalyptic number.

It is an amenable number.

28704805 is a deficient number, since it is larger than the sum of its proper divisors (7238747).

28704805 is a wasteful number, since it uses less digits than its factorization.

28704805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249635.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28704805 is about 5357.6865343168. The cubic root of 28704805 is about 306.1856741199.

The spelling of 28704805 in words is "twenty-eight million, seven hundred four thousand, eight hundred five".