28565791 has 2 divisors, whose sum is σ = 28565792. Its totient is φ = 28565790.

The previous prime is 28565777. The next prime is 28565809. The reversal of 28565791 is 19756582.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28565791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28565731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14282895 + 14282896.

It is an arithmetic number, because the mean of its divisors is an integer number (14282896).

Almost surely, 2^28565791 is an apocalyptic number.

28565791 is a deficient number, since it is larger than the sum of its proper divisors (1).

28565791 is an equidigital number, since it uses as much as digits as its factorization.

28565791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 43.

The square root of 28565791 is about 5344.6974657131. The cubic root of 28565791 is about 305.6906003074.

The spelling of 28565791 in words is "twenty-eight million, five hundred sixty-five thousand, seven hundred ninety-one".