28025856 has 66 divisors (see below), whose sum is σ = 80950662. Its totient is φ = 9338880.

The previous prime is 28025849. The next prime is 28025867. The reversal of 28025856 is 65852082.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 147456 = 5280^2 + 384^2 .

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 28025856.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7696 + ... + 10736.

Almost surely, 2^28025856 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 28025856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40475331).

28025856 is an abundant number, since it is smaller than the sum of its proper divisors (52924806).

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

28025856 is a wasteful number, since it uses less digits than its factorization.

28025856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3067 (or 3046 counting only the distinct ones).

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

The square root of 28025856 is about 5293.9452207215. The cubic root of 28025856 is about 303.7523375322.

The spelling of 28025856 in words is "twenty-eight million, twenty-five thousand, eight hundred fifty-six".