28065856 has 112 divisors (see below), whose sum is σ = 70551040. Its totient is φ = 10782720.

The previous prime is 28065847. The next prime is 28065889. The reversal of 28065856 is 65856082.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355225 + ... + 355303.

It is an arithmetic number, because the mean of its divisors is an integer number (629920).

Almost surely, 2^28065856 is an apocalyptic number.

28065856 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 28065856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35275520).

28065856 is an abundant number, since it is smaller than the sum of its proper divisors (42485184).

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

28065856 is a wasteful number, since it uses less digits than its factorization.

28065856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 28065856 is about 5297.7217744989. The cubic root of 28065856 is about 303.8967793607.

The spelling of 28065856 in words is "twenty-eight million, sixty-five thousand, eight hundred fifty-six".