28788872 has 36 divisors (see below), whose sum is σ = 63024615. Its totient is φ = 12292560.

The previous prime is 28788869. The next prime is 28788901. The reversal of 28788872 is 27888782.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 14394436 + 14394436 = 3794^2 + 3794^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3794.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28788872.

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 8 ways as a sum of consecutive naturals, for example, 106097 + ... + 106367.

Almost surely, 2^28788872 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 28788872

28788872 is an abundant number, since it is smaller than the sum of its proper divisors (34235743).

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

28788872 is an equidigital number, since it uses as much as digits as its factorization.

28788872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 280 counting only the distinct ones).

The product of its digits is 802816, while the sum is 50.

The square root of 28788872 is about 5365.5262556435. The cubic root of 28788872 is about 306.4842887449.

Multiplying 28788872 by its sum of digits (50), we get a square (1439443600 = 37940²).

The spelling of 28788872 in words is "twenty-eight million, seven hundred eighty-eight thousand, eight hundred seventy-two".