28439288 has 16 divisors (see below), whose sum is σ = 53430360. Its totient is φ = 14191200.

The previous prime is 28439287. The next prime is 28439291. The reversal of 28439288 is 88293482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28439287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043 + ... + 7613.

Almost surely, 2^28439288 is an apocalyptic number.

It is an amenable number.

28439288 is a deficient number, since it is larger than the sum of its proper divisors (24991072).

28439288 is a wasteful number, since it uses less digits than its factorization.

28439288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7118 (or 7114 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The square root of 28439288 is about 5332.8498947561. The cubic root of 28439288 is about 305.2386844347.

The spelling of 28439288 in words is "twenty-eight million, four hundred thirty-nine thousand, two hundred eighty-eight".