28249085 has 4 divisors (see below), whose sum is σ = 33898908. Its totient is φ = 22599264.

The previous prime is 28249073. The next prime is 28249097. The reversal of 28249085 is 58094282.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28249073) and next prime (28249097).

It can be written as a sum of positive squares in 2 ways, for example, as 16048036 + 12201049 = 4006^2 + 3493^2 .

It is a cyclic number.

It is not a de Polignac number, because 28249085 - 2²² = 24054781 is a prime.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 2824904 + ... + 2824913.

It is an arithmetic number, because the mean of its divisors is an integer number (8474727).

Almost surely, 2^28249085 is an apocalyptic number.

It is an amenable number.

28249085 is a deficient number, since it is larger than the sum of its proper divisors (5649823).

28249085 is an equidigital number, since it uses as much as digits as its factorization.

28249085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5649822.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 28249085 is about 5314.9868297109. The cubic root of 28249085 is about 304.5566792409.

The spelling of 28249085 in words is "twenty-eight million, two hundred forty-nine thousand, eighty-five".