28252865 has 4 divisors (see below), whose sum is σ = 33903444. Its totient is φ = 22602288.

The previous prime is 28252841. The next prime is 28252871. The reversal of 28252865 is 56825282.

It is a happy number.

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 14047504 + 14205361 = 3748^2 + 3769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28252865 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 2825282 + ... + 2825291.

It is an arithmetic number, because the mean of its divisors is an integer number (8475861).

Almost surely, 2^28252865 is an apocalyptic number.

It is an amenable number.

28252865 is a deficient number, since it is larger than the sum of its proper divisors (5650579).

28252865 is an equidigital number, since it uses as much as digits as its factorization.

28252865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5650578.

The product of its digits is 76800, while the sum is 38.

The square root of 28252865 is about 5315.3424160631. The cubic root of 28252865 is about 304.5702628420.

The spelling of 28252865 in words is "twenty-eight million, two hundred fifty-two thousand, eight hundred sixty-five".