28847231 has 24 divisors (see below), whose sum is σ = 34990704. Its totient is φ = 23694720.

The previous prime is 28847219. The next prime is 28847243. The reversal of 28847231 is 13274882.

It is an interprime number because it is at equal distance from previous prime (28847219) and next prime (28847243).

It is a de Polignac number, because none of the positive numbers 2^k-28847231 is a prime.

It is a super-2 number, since 2×28847231² = 1664325472734722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28847191 and 28847200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28843231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166661 + ... + 166833.

It is an arithmetic number, because the mean of its divisors is an integer number (1457946).

Almost surely, 2^28847231 is an apocalyptic number.

28847231 is a deficient number, since it is larger than the sum of its proper divisors (6143473).

28847231 is a wasteful number, since it uses less digits than its factorization.

28847231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 304 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 28847231 is about 5370.9618319255. The cubic root of 28847231 is about 306.6912442232.

The spelling of 28847231 in words is "twenty-eight million, eight hundred forty-seven thousand, two hundred thirty-one".