28944313 has 4 divisors (see below), whose sum is σ = 29269620. Its totient is φ = 28619008.

The previous prime is 28944299. The next prime is 28944361. The reversal of 28944313 is 31344982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31344982 = 2 ⋅15672491.

It can be written as a sum of positive squares in 2 ways, for example, as 2862864 + 26081449 = 1692^2 + 5107^2 .

It is a cyclic number.

It is not a de Polignac number, because 28944313 - 2¹⁷ = 28813241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28947313) 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, 162520 + ... + 162697.

It is an arithmetic number, because the mean of its divisors is an integer number (7317405).

Almost surely, 2^28944313 is an apocalyptic number.

It is an amenable number.

28944313 is a deficient number, since it is larger than the sum of its proper divisors (325307).

28944313 is an equidigital number, since it uses as much as digits as its factorization.

28944313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325306.

The product of its digits is 20736, while the sum is 34.

The square root of 28944313 is about 5379.9919144921. The cubic root of 28944313 is about 307.0349035638.

The spelling of 28944313 in words is "twenty-eight million, nine hundred forty-four thousand, three hundred thirteen".