28563065591 has 4 divisors (see below), whose sum is σ = 29804938032. Its totient is φ = 27321193152.

The previous prime is 28563065551. The next prime is 28563065599. The reversal of 28563065591 is 19556036582.

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 28563065591 - 2¹⁰ = 28563064567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28563065599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620936186 + ... + 620936231.

It is an arithmetic number, because the mean of its divisors is an integer number (7451234508).

Almost surely, 2^28563065591 is an apocalyptic number.

28563065591 is a deficient number, since it is larger than the sum of its proper divisors (1241872441).

28563065591 is a wasteful number, since it uses less digits than its factorization.

28563065591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241872440.

The product of its (nonzero) digits is 1944000, while the sum is 50.

The spelling of 28563065591 in words is "twenty-eight billion, five hundred sixty-three million, sixty-five thousand, five hundred ninety-one".