28268947 has 4 divisors (see below), whose sum is σ = 32307376. Its totient is φ = 24230520.

The previous prime is 28268917. The next prime is 28268951. The reversal of 28268947 is 74986282.

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 28268947 - 2⁷ = 28268819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28268897 and 28268906.

It is not an unprimeable number, because it can be changed into a prime (28268917) 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, 2019204 + ... + 2019217.

It is an arithmetic number, because the mean of its divisors is an integer number (8076844).

Almost surely, 2^28268947 is an apocalyptic number.

28268947 is a deficient number, since it is larger than the sum of its proper divisors (4038429).

28268947 is an equidigital number, since it uses as much as digits as its factorization.

28268947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038428.

The product of its digits is 387072, while the sum is 46.

The square root of 28268947 is about 5316.8549914400. The cubic root of 28268947 is about 304.6280406980.

The spelling of 28268947 in words is "twenty-eight million, two hundred sixty-eight thousand, nine hundred forty-seven".