28159951 has 4 divisors (see below), whose sum is σ = 28175392. Its totient is φ = 28144512.

The previous prime is 28159927. The next prime is 28159993. The reversal of 28159951 is 15995182.

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 28159951 - 2¹⁷ = 28028879 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 (28159051) 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, 4551 + ... + 8776.

It is an arithmetic number, because the mean of its divisors is an integer number (7043848).

Almost surely, 2^28159951 is an apocalyptic number.

28159951 is a deficient number, since it is larger than the sum of its proper divisors (15441).

28159951 is a wasteful number, since it uses less digits than its factorization.

28159951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15440.

The product of its digits is 32400, while the sum is 40.

The square root of 28159951 is about 5306.5950476742. The cubic root of 28159951 is about 304.2360203981.

The spelling of 28159951 in words is "twenty-eight million, one hundred fifty-nine thousand, nine hundred fifty-one".