28564091 has 8 divisors (see below), whose sum is σ = 29942784. Its totient is φ = 27196840.

The previous prime is 28564079. The next prime is 28564099. The reversal of 28564091 is 19046582.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28564091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28564099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2486 + ... + 7956.

It is an arithmetic number, because the mean of its divisors is an integer number (3742848).

Almost surely, 2^28564091 is an apocalyptic number.

28564091 is a deficient number, since it is larger than the sum of its proper divisors (1378693).

28564091 is a wasteful number, since it uses less digits than its factorization.

28564091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5721.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 28564091 is about 5344.5384272171. The cubic root of 28564091 is about 305.6845361270.

The spelling of 28564091 in words is "twenty-eight million, five hundred sixty-four thousand, ninety-one".