28107161 has 4 divisors (see below), whose sum is σ = 28866852. Its totient is φ = 27347472.

The previous prime is 28107151. The next prime is 28107193. The reversal of 28107161 is 16170182.

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 25563136 + 2544025 = 5056^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 28107161 - 2⁶ = 28107097 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 28107161.

It is not an unprimeable number, because it can be changed into a prime (28107151) 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, 379790 + ... + 379863.

It is an arithmetic number, because the mean of its divisors is an integer number (7216713).

Almost surely, 2^28107161 is an apocalyptic number.

It is an amenable number.

28107161 is a deficient number, since it is larger than the sum of its proper divisors (759691).

28107161 is an equidigital number, since it uses as much as digits as its factorization.

28107161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759690.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 28107161 is about 5301.6187150718. The cubic root of 28107161 is about 304.0457896458.

The spelling of 28107161 in words is "twenty-eight million, one hundred seven thousand, one hundred sixty-one".