28866161 has 4 divisors (see below), whose sum is σ = 28893300. Its totient is φ = 28839024.

The previous prime is 28866157. The next prime is 28866191. The reversal of 28866161 is 16166882.

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

It can be written as a sum of positive squares in 2 ways, for example, as 776161 + 28090000 = 881^2 + 5300^2 .

It is a cyclic number.

It is not a de Polignac number, because 28866161 - 2² = 28866157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28866151) 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, 11906 + ... + 14123.

It is an arithmetic number, because the mean of its divisors is an integer number (7223325).

Almost surely, 2^28866161 is an apocalyptic number.

It is an amenable number.

28866161 is a deficient number, since it is larger than the sum of its proper divisors (27139).

28866161 is a wasteful number, since it uses less digits than its factorization.

28866161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27138.

The product of its digits is 27648, while the sum is 38.

The square root of 28866161 is about 5372.7237971070. The cubic root of 28866161 is about 306.7583147368.

The spelling of 28866161 in words is "twenty-eight million, eight hundred sixty-six thousand, one hundred sixty-one".