28238856 has 32 divisors (see below), whose sum is σ = 70748640. Its totient is φ = 9392768.

The previous prime is 28238849. The next prime is 28238857. The reversal of 28238856 is 65883282.

It is not an unprimeable number, because it can be changed into a prime (28238857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13855 + ... + 15761.

It is an arithmetic number, because the mean of its divisors is an integer number (2210895).

Almost surely, 2^28238856 is an apocalyptic number.

It is an amenable number.

28238856 is an abundant number, since it is smaller than the sum of its proper divisors (42509784).

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

28238856 is a wasteful number, since it uses less digits than its factorization.

28238856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533 (or 2529 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The square root of 28238856 is about 5314.0244636245. The cubic root of 28238856 is about 304.5199147892.

The spelling of 28238856 in words is "twenty-eight million, two hundred thirty-eight thousand, eight hundred fifty-six".