28243165 has 8 divisors (see below), whose sum is σ = 33968088. Its totient is φ = 22543680.

The previous prime is 28243153. The next prime is 28243181. The reversal of 28243165 is 56134282.

It can be written as a sum of positive squares in 4 ways, for example, as 1390041 + 26853124 = 1179^2 + 5182^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28243165 - 2⁵ = 28243133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3822 + ... + 8431.

It is an arithmetic number, because the mean of its divisors is an integer number (4246011).

Almost surely, 2^28243165 is an apocalyptic number.

It is an amenable number.

28243165 is a deficient number, since it is larger than the sum of its proper divisors (5724923).

28243165 is a wasteful number, since it uses less digits than its factorization.

28243165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12719.

The product of its digits is 11520, while the sum is 31.

The square root of 28243165 is about 5314.4298847572. The cubic root of 28243165 is about 304.5354030179.

The spelling of 28243165 in words is "twenty-eight million, two hundred forty-three thousand, one hundred sixty-five".