28039256 has 32 divisors (see below), whose sum is σ = 63620640. Its totient is φ = 11309568.

The previous prime is 28039247. The next prime is 28039261. The reversal of 28039256 is 65293082.

It is a super-3 number, since 3×28039256³ (a number of 23 digits) contains 333 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 13775 + ... + 15678.

It is an arithmetic number, because the mean of its divisors is an integer number (1988145).

Almost surely, 2^28039256 is an apocalyptic number.

It is an amenable number.

28039256 is an abundant number, since it is smaller than the sum of its proper divisors (35581384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28039256 is a wasteful number, since it uses less digits than its factorization.

28039256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29483 (or 29479 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 28039256 is about 5295.2106662530. The cubic root of 28039256 is about 303.8007408446.

The spelling of 28039256 in words is "twenty-eight million, thirty-nine thousand, two hundred fifty-six".