28159423 has 4 divisors (see below), whose sum is σ = 28230048. Its totient is φ = 28088800.

The previous prime is 28159421. The next prime is 28159433. The reversal of 28159423 is 32495182.

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 28159423 - 2¹ = 28159421 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 (28159421) 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, 34711 + ... + 35512.

It is an arithmetic number, because the mean of its divisors is an integer number (7057512).

Almost surely, 2^28159423 is an apocalyptic number.

28159423 is a deficient number, since it is larger than the sum of its proper divisors (70625).

28159423 is an equidigital number, since it uses as much as digits as its factorization.

28159423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70624.

The product of its digits is 17280, while the sum is 34.

The square root of 28159423 is about 5306.5452980258. The cubic root of 28159423 is about 304.2341189077.

It can be divided in two parts, 28159 and 423, that added together give a palindrome (28582).

The spelling of 28159423 in words is "twenty-eight million, one hundred fifty-nine thousand, four hundred twenty-three".