28566023 has 4 divisors (see below), whose sum is σ = 29808048. Its totient is φ = 27324000.

The previous prime is 28566019. The next prime is 28566047. The reversal of 28566023 is 32066582.

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

It is not a de Polignac number, because 28566023 - 2² = 28566019 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 (28566323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620978 + ... + 621023.

It is an arithmetic number, because the mean of its divisors is an integer number (7452012).

Almost surely, 2^28566023 is an apocalyptic number.

28566023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28566023 is a deficient number, since it is larger than the sum of its proper divisors (1242025).

28566023 is a wasteful number, since it uses less digits than its factorization.

28566023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242024.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 28566023 is about 5344.7191694232. The cubic root of 28566023 is about 305.6914278710.

The spelling of 28566023 in words is "twenty-eight million, five hundred sixty-six thousand, twenty-three".