28605161 has 4 divisors (see below), whose sum is σ = 30805572. Its totient is φ = 26404752.

The previous prime is 28605149. The next prime is 28605163. The reversal of 28605161 is 16150682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16150682 = 2 ⋅8075341.

It can be written as a sum of positive squares in 2 ways, for example, as 15960025 + 12645136 = 3995^2 + 3556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28605161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28605163) 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, 1100186 + ... + 1100211.

It is an arithmetic number, because the mean of its divisors is an integer number (7701393).

Almost surely, 2^28605161 is an apocalyptic number.

It is an amenable number.

28605161 is a deficient number, since it is larger than the sum of its proper divisors (2200411).

28605161 is a wasteful number, since it uses less digits than its factorization.

28605161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200410.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28605161 is about 5348.3792872234. The cubic root of 28605161 is about 305.8309723370.

The spelling of 28605161 in words is "twenty-eight million, six hundred five thousand, one hundred sixty-one".