28716913 has 2 divisors, whose sum is σ = 28716914. Its totient is φ = 28716912.

The previous prime is 28716901. The next prime is 28716971. The reversal of 28716913 is 31961782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17740944 + 10975969 = 4212^2 + 3313^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28716913 is a prime.

It is a super-2 number, since 2×28716913² = 1649322184499138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28716613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14358456 + 14358457.

It is an arithmetic number, because the mean of its divisors is an integer number (14358457).

Almost surely, 2^28716913 is an apocalyptic number.

It is an amenable number.

28716913 is a deficient number, since it is larger than the sum of its proper divisors (1).

28716913 is an equidigital number, since it uses as much as digits as its factorization.

28716913 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28716913 is about 5358.8163805079. The cubic root of 28716913 is about 306.2287188877.

The spelling of 28716913 in words is "twenty-eight million, seven hundred sixteen thousand, nine hundred thirteen".