28272289 has 8 divisors (see below), whose sum is σ = 28768608. Its totient is φ = 27780480.

The previous prime is 28272287. The next prime is 28272301. The reversal of 28272289 is 98227282.

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

It is a cyclic number.

It is not a de Polignac number, because 28272289 - 2¹ = 28272287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28272287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13009 + ... + 15025.

It is an arithmetic number, because the mean of its divisors is an integer number (3596076).

Almost surely, 2^28272289 is an apocalyptic number.

It is an amenable number.

28272289 is a deficient number, since it is larger than the sum of its proper divisors (496319).

28272289 is a wasteful number, since it uses less digits than its factorization.

28272289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255.

The product of its digits is 64512, while the sum is 40.

The square root of 28272289 is about 5317.1692656902. The cubic root of 28272289 is about 304.6400447626.

It can be divided in two parts, 28272 and 289, that added together give a 4-th power (28561 = 13⁴).

The spelling of 28272289 in words is "twenty-eight million, two hundred seventy-two thousand, two hundred eighty-nine".