28256736 has 24 divisors (see below), whose sum is σ = 74174184. Its totient is φ = 9418880.

The previous prime is 28256713. The next prime is 28256741. The reversal of 28256736 is 63765282.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 28256694 and 28256703.

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 3 ways as a sum of consecutive naturals, for example, 147075 + ... + 147266.

It is an arithmetic number, because the mean of its divisors is an integer number (3090591).

Almost surely, 2^28256736 is an apocalyptic number.

It is an amenable number.

28256736 is an abundant number, since it is smaller than the sum of its proper divisors (45917448).

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

28256736 is a wasteful number, since it uses less digits than its factorization.

28256736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294354 (or 294346 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The square root of 28256736 is about 5315.7065381753. The cubic root of 28256736 is about 304.5841722000.

The spelling of 28256736 in words is "twenty-eight million, two hundred fifty-six thousand, seven hundred thirty-six".