28664827 has 4 divisors (see below), whose sum is σ = 28707480. Its totient is φ = 28622176.

The previous prime is 28664821. The next prime is 28664833. The reversal of 28664827 is 72846682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72846682 = 2 ⋅36423341.

It is an interprime number because it is at equal distance from previous prime (28664821) and next prime (28664833).

It is a cyclic number.

It is not a de Polignac number, because 28664827 - 2¹¹ = 28662779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28664821) 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 3 ways as a sum of consecutive naturals, for example, 20302 + ... + 21667.

It is an arithmetic number, because the mean of its divisors is an integer number (7176870).

Almost surely, 2^28664827 is an apocalyptic number.

28664827 is a deficient number, since it is larger than the sum of its proper divisors (42653).

28664827 is an equidigital number, since it uses as much as digits as its factorization.

28664827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42652.

The product of its digits is 258048, while the sum is 43.

The square root of 28664827 is about 5353.9543330141. The cubic root of 28664827 is about 306.0434635743.

The spelling of 28664827 in words is "twenty-eight million, six hundred sixty-four thousand, eight hundred twenty-seven".