28663023 has 4 divisors (see below), whose sum is σ = 38217368. Its totient is φ = 19108680.

The previous prime is 28663007. The next prime is 28663027. The reversal of 28663023 is 32036682.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28663023 - 2⁴ = 28663007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28663027) 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, 4777168 + ... + 4777173.

It is an arithmetic number, because the mean of its divisors is an integer number (9554342).

Almost surely, 2^28663023 is an apocalyptic number.

28663023 is a deficient number, since it is larger than the sum of its proper divisors (9554345).

28663023 is an equidigital number, since it uses as much as digits as its factorization.

28663023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9554344.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 28663023 is about 5353.7858567559. The cubic root of 28663023 is about 306.0370432322.

The spelling of 28663023 in words is "twenty-eight million, six hundred sixty-three thousand, twenty-three".