28831313 has 4 divisors (see below), whose sum is σ = 32950080. Its totient is φ = 24712548.

The previous prime is 28831301. The next prime is 28831321. The reversal of 28831313 is 31313882.

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 not a de Polignac number, because 28831313 - 2²⁰ = 27782737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28831393) 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, 2059373 + ... + 2059386.

It is an arithmetic number, because the mean of its divisors is an integer number (8237520).

Almost surely, 2^28831313 is an apocalyptic number.

It is an amenable number.

28831313 is a deficient number, since it is larger than the sum of its proper divisors (4118767).

28831313 is an equidigital number, since it uses as much as digits as its factorization.

28831313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4118766.

The product of its digits is 3456, while the sum is 29.

The square root of 28831313 is about 5369.4797699591. The cubic root of 28831313 is about 306.6348227542.

The spelling of 28831313 in words is "twenty-eight million, eight hundred thirty-one thousand, three hundred thirteen".