28159923 has 16 divisors (see below), whose sum is σ = 42068736. Its totient is φ = 16604640.

The previous prime is 28159897. The next prime is 28159927. The reversal of 28159923 is 32995182.

It is a de Polignac number, because none of the positive numbers 2^k-28159923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28159927) 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 15 ways as a sum of consecutive naturals, for example, 10311 + ... + 12752.

It is an arithmetic number, because the mean of its divisors is an integer number (2629296).

Almost surely, 2^28159923 is an apocalyptic number.

28159923 is a deficient number, since it is larger than the sum of its proper divisors (13908813).

28159923 is a wasteful number, since it uses less digits than its factorization.

28159923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23114.

The product of its digits is 38880, while the sum is 39.

The square root of 28159923 is about 5306.5924094470. The cubic root of 28159923 is about 304.2359195620.

It can be divided in two parts, 28 and 159923, that added together give a palindrome (159951).

The spelling of 28159923 in words is "twenty-eight million, one hundred fifty-nine thousand, nine hundred twenty-three".