28865171 has 4 divisors (see below), whose sum is σ = 28888344. Its totient is φ = 28842000.

The previous prime is 28865153. The next prime is 28865197. The reversal of 28865171 is 17156882.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28865171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28865131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9605 + ... + 12246.

It is an arithmetic number, because the mean of its divisors is an integer number (7222086).

Almost surely, 2^28865171 is an apocalyptic number.

28865171 is a deficient number, since it is larger than the sum of its proper divisors (23173).

28865171 is a wasteful number, since it uses less digits than its factorization.

28865171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23172.

The product of its digits is 26880, while the sum is 38.

The square root of 28865171 is about 5372.6316642778. The cubic root of 28865171 is about 306.7548078139.

The spelling of 28865171 in words is "twenty-eight million, eight hundred sixty-five thousand, one hundred seventy-one".