28342161 has 6 divisors (see below), whose sum is σ = 40938690. Its totient is φ = 18894768.

The previous prime is 28342157. The next prime is 28342163. The reversal of 28342161 is 16124382.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 463761 = 5280^2 + 681^2 .

It is not a de Polignac number, because 28342161 - 2² = 28342157 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28342163) 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 5 ways as a sum of consecutive naturals, for example, 1574556 + ... + 1574573.

It is an arithmetic number, because the mean of its divisors is an integer number (6823115).

Almost surely, 2^28342161 is an apocalyptic number.

It is an amenable number.

28342161 is a deficient number, since it is larger than the sum of its proper divisors (12596529).

28342161 is a wasteful number, since it uses less digits than its factorization.

28342161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3149135 (or 3149132 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 28342161 is about 5323.7356245403. The cubic root of 28342161 is about 304.8908002878.

The spelling of 28342161 in words is "twenty-eight million, three hundred forty-two thousand, one hundred sixty-one".