28565056 has 84 divisors (see below), whose sum is σ = 65074800. Its totient is φ = 12400128.

The previous prime is 28565003. The next prime is 28565059. The reversal of 28565056 is 65056582.

It is not an unprimeable number, because it can be changed into a prime (28565059) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 205435 + ... + 205573.

It is an arithmetic number, because the mean of its divisors is an integer number (774700).

Almost surely, 2^28565056 is an apocalyptic number.

28565056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28565056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32537400).

28565056 is an abundant number, since it is smaller than the sum of its proper divisors (36509744).

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

28565056 is a wasteful number, since it uses less digits than its factorization.

28565056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 28565056 is about 5344.6287055323. The cubic root of 28565056 is about 305.6879784707.

It can be divided in two parts, 285 and 65056, that added together give a triangular number (65341 = T₃₆₁).

The spelling of 28565056 in words is "twenty-eight million, five hundred sixty-five thousand, fifty-six".