28664817 has 4 divisors (see below), whose sum is σ = 38219760. Its totient is φ = 19109876.

The previous prime is 28664809. The next prime is 28664821. The reversal of 28664817 is 71846682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28664817 - 2³ = 28664809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28664807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4777467 + ... + 4777472.

It is an arithmetic number, because the mean of its divisors is an integer number (9554940).

Almost surely, 2^28664817 is an apocalyptic number.

It is an amenable number.

28664817 is a deficient number, since it is larger than the sum of its proper divisors (9554943).

28664817 is an equidigital number, since it uses as much as digits as its factorization.

28664817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9554942.

The product of its digits is 129024, while the sum is 42.

The square root of 28664817 is about 5353.9533991248. The cubic root of 28664817 is about 306.0434279856.

The spelling of 28664817 in words is "twenty-eight million, six hundred sixty-four thousand, eight hundred seventeen".