28274285 has 8 divisors (see below), whose sum is σ = 36539160. Its totient is φ = 20879424.

The previous prime is 28274251. The next prime is 28274329. The reversal of 28274285 is 58247282.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5368489 + 22905796 = 2317^2 + 4786^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28274285 - 2¹² = 28270189 is a prime.

It is a super-2 number, since 2×28274285² = 1598870384522450, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 217430 + ... + 217559.

It is an arithmetic number, because the mean of its divisors is an integer number (4567395).

Almost surely, 2^28274285 is an apocalyptic number.

It is an amenable number.

28274285 is a deficient number, since it is larger than the sum of its proper divisors (8264875).

28274285 is a wasteful number, since it uses less digits than its factorization.

28274285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435007.

The product of its digits is 71680, while the sum is 38.

The square root of 28274285 is about 5317.3569562330. The cubic root of 28274285 is about 304.6472137049.

The spelling of 28274285 in words is "twenty-eight million, two hundred seventy-four thousand, two hundred eighty-five".