28159331 has 8 divisors (see below), whose sum is σ = 28992480. Its totient is φ = 27330048.

The previous prime is 28159301. The next prime is 28159379. The reversal of 28159331 is 13395182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28159331 is a prime.

It is a super-2 number, since 2×28159331² = 1585895844735122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28159301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20690 + ... + 22008.

It is an arithmetic number, because the mean of its divisors is an integer number (3624060).

Almost surely, 2^28159331 is an apocalyptic number.

28159331 is a deficient number, since it is larger than the sum of its proper divisors (833149).

28159331 is a wasteful number, since it uses less digits than its factorization.

28159331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933.

The product of its digits is 6480, while the sum is 32.

The square root of 28159331 is about 5306.5366294788. The cubic root of 28159331 is about 304.2337875850.

The spelling of 28159331 in words is "twenty-eight million, one hundred fifty-nine thousand, three hundred thirty-one".