28159957 has 32 divisors (see below), whose sum is σ = 36000000. Its totient is φ = 21930048.

The previous prime is 28159927. The next prime is 28159993. The reversal of 28159957 is 75995182.

It is not a de Polignac number, because 28159957 - 2⁷ = 28159829 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 (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 31 ways as a sum of consecutive naturals, for example, 188919 + ... + 189067.

It is an arithmetic number, because the mean of its divisors is an integer number (1125000).

Almost surely, 2^28159957 is an apocalyptic number.

It is an amenable number.

28159957 is a deficient number, since it is larger than the sum of its proper divisors (7840043).

28159957 is a wasteful number, since it uses less digits than its factorization.

28159957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 204 counting only the distinct ones).

The product of its digits is 226800, while the sum is 46.

The square root of 28159957 is about 5306.5956130084. The cubic root of 28159957 is about 304.2360420058.

The spelling of 28159957 in words is "twenty-eight million, one hundred fifty-nine thousand, nine hundred fifty-seven".