28174865 has 16 divisors (see below), whose sum is σ = 36138960. Its totient is φ = 21012480.

The previous prime is 28174849. The next prime is 28174873. The reversal of 28174865 is 56847182.

It is a Cunningham number, because it is equal to 5308²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 6431296 + 21743569 = 2536^2 + 4663^2 .

It is not a de Polignac number, because 28174865 - 2⁴ = 28174849 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7745 + ... + 10785.

It is an arithmetic number, because the mean of its divisors is an integer number (2258685).

Almost surely, 2^28174865 is an apocalyptic number.

It is an amenable number.

28174865 is a deficient number, since it is larger than the sum of its proper divisors (7964095).

28174865 is a wasteful number, since it uses less digits than its factorization.

28174865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3172.

The product of its digits is 107520, while the sum is 41.

The square root of 28174865 is about 5308.0000941974. Note that the first 4 decimals coincide. The cubic root of 28174865 is about 304.2897204823.

The spelling of 28174865 in words is "twenty-eight million, one hundred seventy-four thousand, eight hundred sixty-five".