28438244 has 6 divisors (see below), whose sum is σ = 49766934. Its totient is φ = 14219120.

The previous prime is 28438213. The next prime is 28438247. The reversal of 28438244 is 44283482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28217344 + 220900 = 5312^2 + 470^2 .

It is not an unprimeable number, because it can be changed into a prime (28438247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3554777 + ... + 3554784.

It is an arithmetic number, because the mean of its divisors is an integer number (8294489).

Almost surely, 2^28438244 is an apocalyptic number.

It is an amenable number.

28438244 is a deficient number, since it is larger than the sum of its proper divisors (21328690).

28438244 is a wasteful number, since it uses less digits than its factorization.

28438244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7109565 (or 7109563 counting only the distinct ones).

The product of its digits is 49152, while the sum is 35.

The square root of 28438244 is about 5332.7520099851. The cubic root of 28438244 is about 305.2349493074.

It can be divided in two parts, 28438 and 244, that added together give a palindrome (28682).

The spelling of 28438244 in words is "twenty-eight million, four hundred thirty-eight thousand, two hundred forty-four".