28159651 has 4 divisors (see below), whose sum is σ = 30325792. Its totient is φ = 25993512.

The previous prime is 28159639. The next prime is 28159657. The reversal of 28159651 is 15695182.

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 28159651 - 2⁹ = 28159139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28159651.

It is not an unprimeable number, because it can be changed into a prime (28159657) 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, 1083051 + ... + 1083076.

It is an arithmetic number, because the mean of its divisors is an integer number (7581448).

Almost surely, 2^28159651 is an apocalyptic number.

28159651 is a deficient number, since it is larger than the sum of its proper divisors (2166141).

28159651 is a wasteful number, since it uses less digits than its factorization.

28159651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166140.

The product of its digits is 21600, while the sum is 37.

The square root of 28159651 is about 5306.5667808857. The cubic root of 28159651 is about 304.2349400087.

The spelling of 28159651 in words is "twenty-eight million, one hundred fifty-nine thousand, six hundred fifty-one".