28564715 has 4 divisors (see below), whose sum is σ = 34277664. Its totient is φ = 22851768.

The previous prime is 28564687. The next prime is 28564717. The reversal of 28564715 is 51746582.

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 28564715 - 2¹² = 28560619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28564717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2856467 + ... + 2856476.

It is an arithmetic number, because the mean of its divisors is an integer number (8569416).

Almost surely, 2^28564715 is an apocalyptic number.

28564715 is a deficient number, since it is larger than the sum of its proper divisors (5712949).

28564715 is an equidigital number, since it uses as much as digits as its factorization.

28564715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5712948.

The product of its digits is 67200, while the sum is 38.

The square root of 28564715 is about 5344.5968042501. The cubic root of 28564715 is about 305.6867620659.

The spelling of 28564715 in words is "twenty-eight million, five hundred sixty-four thousand, seven hundred fifteen".