28185159 has 4 divisors (see below), whose sum is σ = 37580216. Its totient is φ = 18790104.

The previous prime is 28185137. The next prime is 28185181. The reversal of 28185159 is 95158182.

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

It is an interprime number because it is at equal distance from previous prime (28185137) and next prime (28185181).

It is not a de Polignac number, because 28185159 - 2⁸ = 28184903 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 (28185109) 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, 4697524 + ... + 4697529.

It is an arithmetic number, because the mean of its divisors is an integer number (9395054).

Almost surely, 2^28185159 is an apocalyptic number.

28185159 is a deficient number, since it is larger than the sum of its proper divisors (9395057).

28185159 is an equidigital number, since it uses as much as digits as its factorization.

28185159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9395056.

The product of its digits is 28800, while the sum is 39.

The square root of 28185159 is about 5308.9696740516. The cubic root of 28185159 is about 304.3267745134.

The spelling of 28185159 in words is "twenty-eight million, one hundred eighty-five thousand, one hundred fifty-nine".