28516913 has 4 divisors (see below), whose sum is σ = 28531200. Its totient is φ = 28502628.

The previous prime is 28516909. The next prime is 28516919. The reversal of 28516913 is 31961582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28516913 - 2² = 28516909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28516919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3545 + ... + 8342.

It is an arithmetic number, because the mean of its divisors is an integer number (7132800).

Almost surely, 2^28516913 is an apocalyptic number.

It is an amenable number.

28516913 is a deficient number, since it is larger than the sum of its proper divisors (14287).

28516913 is a wasteful number, since it uses less digits than its factorization.

28516913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14286.

The product of its digits is 12960, while the sum is 35.

The square root of 28516913 is about 5340.1229386597. The cubic root of 28516913 is about 305.5161483406.

The spelling of 28516913 in words is "twenty-eight million, five hundred sixteen thousand, nine hundred thirteen".