28165241 has 4 divisors (see below), whose sum is σ = 30331812. Its totient is φ = 25998672.

The previous prime is 28165223. The next prime is 28165261. The reversal of 28165241 is 14256182.

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 15241216 + 12924025 = 3904^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 28165241 - 2¹⁸ = 27903097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28165261) 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, 1083266 + ... + 1083291.

It is an arithmetic number, because the mean of its divisors is an integer number (7582953).

Almost surely, 2^28165241 is an apocalyptic number.

It is an amenable number.

28165241 is a deficient number, since it is larger than the sum of its proper divisors (2166571).

28165241 is a wasteful number, since it uses less digits than its factorization.

28165241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166570.

The product of its digits is 3840, while the sum is 29.

The square root of 28165241 is about 5307.0934606430. The cubic root of 28165241 is about 304.2550700025.

The spelling of 28165241 in words is "twenty-eight million, one hundred sixty-five thousand, two hundred forty-one".