28296289 has 4 divisors (see below), whose sum is σ = 32338624. Its totient is φ = 24253956.

The previous prime is 28296287. The next prime is 28296293. The reversal of 28296289 is 98269282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28296289 - 2¹ = 28296287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28296283) 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, 2021157 + ... + 2021170.

It is an arithmetic number, because the mean of its divisors is an integer number (8084656).

Almost surely, 2^28296289 is an apocalyptic number.

It is an amenable number.

28296289 is a deficient number, since it is larger than the sum of its proper divisors (4042335).

28296289 is an equidigital number, since it uses as much as digits as its factorization.

28296289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042334.

The product of its digits is 248832, while the sum is 46.

The square root of 28296289 is about 5319.4256268887. The cubic root of 28296289 is about 304.7262221170.

The spelling of 28296289 in words is "twenty-eight million, two hundred ninety-six thousand, two hundred eighty-nine".