28311259 has 4 divisors (see below), whose sum is σ = 28775440. Its totient is φ = 27847080.

The previous prime is 28311251. The next prime is 28311271. The reversal of 28311259 is 95211382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28311259 - 2³ = 28311251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28311259.

It is not an unprimeable number, because it can be changed into a prime (28311251) 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, 231999 + ... + 232120.

It is an arithmetic number, because the mean of its divisors is an integer number (7193860).

Almost surely, 2^28311259 is an apocalyptic number.

28311259 is a deficient number, since it is larger than the sum of its proper divisors (464181).

28311259 is an equidigital number, since it uses as much as digits as its factorization.

28311259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464180.

The product of its digits is 4320, while the sum is 31.

The square root of 28311259 is about 5320.8325476376. The cubic root of 28311259 is about 304.7799505680.

The spelling of 28311259 in words is "twenty-eight million, three hundred eleven thousand, two hundred fifty-nine".