28278256 has 20 divisors (see below), whose sum is σ = 55824552. Its totient is φ = 13871936.

The previous prime is 28278253. The next prime is 28278301. The reversal of 28278256 is 65287282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28278253) by changing a digit.

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, 15826 + ... + 17521.

Almost surely, 2^28278256 is an apocalyptic number.

It is an amenable number.

28278256 is a deficient number, since it is larger than the sum of its proper divisors (27546296).

28278256 is a wasteful number, since it uses less digits than its factorization.

28278256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33408 (or 33402 counting only the distinct ones).

The product of its digits is 107520, while the sum is 40.

The square root of 28278256 is about 5317.7303429189. The cubic root of 28278256 is about 304.6614751613.

The spelling of 28278256 in words is "twenty-eight million, two hundred seventy-eight thousand, two hundred fifty-six".