28968947 has 12 divisors (see below), whose sum is σ = 33963336. Its totient is φ = 24635520.

The previous prime is 28968943. The next prime is 28968949. The reversal of 28968947 is 74986982.

It is not a de Polignac number, because 28968947 - 2² = 28968943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28968943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4163 + ... + 8675.

It is an arithmetic number, because the mean of its divisors is an integer number (2830278).

Almost surely, 2^28968947 is an apocalyptic number.

28968947 is a deficient number, since it is larger than the sum of its proper divisors (4994389).

28968947 is a wasteful number, since it uses less digits than its factorization.

28968947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4658 (or 4651 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 53.

The square root of 28968947 is about 5382.2808362255. The cubic root of 28968947 is about 307.1219828818.

The spelling of 28968947 in words is "twenty-eight million, nine hundred sixty-eight thousand, nine hundred forty-seven".