28788842 has 8 divisors (see below), whose sum is σ = 43209732. Its totient is φ = 14385600.

The previous prime is 28788841. The next prime is 28788853. The reversal of 28788842 is 24888782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25694761 + 3094081 = 5069^2 + 1759^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28788841) by changing a digit.

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, 992 + ... + 7652.

Almost surely, 2^28788842 is an apocalyptic number.

28788842 is a deficient number, since it is larger than the sum of its proper divisors (14420890).

28788842 is a wasteful number, since it uses less digits than its factorization.

28788842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8824.

The product of its digits is 458752, while the sum is 47.

The square root of 28788842 is about 5365.5234600177. The cubic root of 28788842 is about 306.4841822856.

The spelling of 28788842 in words is "twenty-eight million, seven hundred eighty-eight thousand, eight hundred forty-two".