28503872 has 28 divisors (see below), whose sum is σ = 57346596. Its totient is φ = 14054400.

The previous prime is 28503869. The next prime is 28503889. The reversal of 28503872 is 27830582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17106496 + 11397376 = 4136^2 + 3376^2 .

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, 1622 + ... + 7722.

Almost surely, 2^28503872 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 28503872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28673298).

28503872 is an abundant number, since it is smaller than the sum of its proper divisors (28842724).

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

28503872 is an equidigital number, since it uses as much as digits as its factorization.

28503872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6186 (or 6176 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28503872 is about 5338.9017597255. The cubic root of 28503872 is about 305.4695696245.

The spelling of 28503872 in words is "twenty-eight million, five hundred three thousand, eight hundred seventy-two".