28316931 has 4 divisors (see below), whose sum is σ = 37755912. Its totient is φ = 18877952.

The previous prime is 28316929. The next prime is 28316957. The reversal of 28316931 is 13961382.

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 28316931 - 2¹ = 28316929 is a prime.

It is a super-2 number, since 2×28316931² = 1603697162517522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28316892 and 28316901.

It is not an unprimeable number, because it can be changed into a prime (28316921) 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, 4719486 + ... + 4719491.

It is an arithmetic number, because the mean of its divisors is an integer number (9438978).

Almost surely, 2^28316931 is an apocalyptic number.

28316931 is a deficient number, since it is larger than the sum of its proper divisors (9438981).

28316931 is an equidigital number, since it uses as much as digits as its factorization.

28316931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9438980.

The product of its digits is 7776, while the sum is 33.

The square root of 28316931 is about 5321.3655202401. The cubic root of 28316931 is about 304.8003028531.

The spelling of 28316931 in words is "twenty-eight million, three hundred sixteen thousand, nine hundred thirty-one".