28805256 has 48 divisors (see below), whose sum is σ = 78764400. Its totient is φ = 9509472.

The previous prime is 28805239. The next prime is 28805267. The reversal of 28805256 is 65250882.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28805256.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 5835 + ... + 9573.

It is an arithmetic number, because the mean of its divisors is an integer number (1640925).

Almost surely, 2^28805256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28805256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39382200).

28805256 is an abundant number, since it is smaller than the sum of its proper divisors (49959144).

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

28805256 is a wasteful number, since it uses less digits than its factorization.

28805256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3858 (or 3851 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 28805256 is about 5367.0528225461. The cubic root of 28805256 is about 306.5424186860.

The spelling of 28805256 in words is "twenty-eight million, eight hundred five thousand, two hundred fifty-six".