27989023 has 4 divisors (see below), whose sum is σ = 28008288. Its totient is φ = 27969760.

The previous prime is 27989009. The next prime is 27989041. The reversal of 27989023 is 32098972.

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

It is a cyclic number.

It is not a de Polignac number, because 27989023 - 2⁵ = 27988991 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27989623) 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, 7258 + ... + 10423.

It is an arithmetic number, because the mean of its divisors is an integer number (7002072).

Almost surely, 2^27989023 is an apocalyptic number.

27989023 is a deficient number, since it is larger than the sum of its proper divisors (19265).

27989023 is a wasteful number, since it uses less digits than its factorization.

27989023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19264.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 27989023 is about 5290.4652914465. The cubic root of 27989023 is about 303.6192102900.

The spelling of 27989023 in words is "twenty-seven million, nine hundred eighty-nine thousand, twenty-three".