28716931 has 4 divisors (see below), whose sum is σ = 29707200. Its totient is φ = 27726664.

The previous prime is 28716913. The next prime is 28716971. The reversal of 28716931 is 13961782.

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 28716931 - 2⁵ = 28716899 is a prime.

It is a super-2 number, since 2×28716931² = 1649324252117522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28716901) 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, 495091 + ... + 495148.

It is an arithmetic number, because the mean of its divisors is an integer number (7426800).

Almost surely, 2^28716931 is an apocalyptic number.

28716931 is a deficient number, since it is larger than the sum of its proper divisors (990269).

28716931 is an equidigital number, since it uses as much as digits as its factorization.

28716931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990268.

The product of its digits is 18144, while the sum is 37.

The square root of 28716931 is about 5358.8180599830. The cubic root of 28716931 is about 306.2287828700.

The spelling of 28716931 in words is "twenty-eight million, seven hundred sixteen thousand, nine hundred thirty-one".