28974293 has 4 divisors (see below), whose sum is σ = 29757420. Its totient is φ = 28191168.

The previous prime is 28974289. The next prime is 28974317. The reversal of 28974293 is 39247982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20811844 + 8162449 = 4562^2 + 2857^2 .

It is a cyclic number.

It is not a de Polignac number, because 28974293 - 2² = 28974289 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28974203) 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, 391508 + ... + 391581.

It is an arithmetic number, because the mean of its divisors is an integer number (7439355).

Almost surely, 2^28974293 is an apocalyptic number.

It is an amenable number.

28974293 is a deficient number, since it is larger than the sum of its proper divisors (783127).

28974293 is an equidigital number, since it uses as much as digits as its factorization.

28974293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783126.

The product of its digits is 217728, while the sum is 44.

The square root of 28974293 is about 5382.7774429192. Note that the first 3 decimals coincide. The cubic root of 28974293 is about 307.1408740658.

The spelling of 28974293 in words is "twenty-eight million, nine hundred seventy-four thousand, two hundred ninety-three".