28065207571 has 4 divisors (see below), whose sum is σ = 29716102152. Its totient is φ = 26414312992.

The previous prime is 28065207563. The next prime is 28065207601. The reversal of 28065207571 is 17570256082.

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 28065207571 - 2³ = 28065207563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28065297571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825447265 + ... + 825447298.

It is an arithmetic number, because the mean of its divisors is an integer number (7429025538).

Almost surely, 2^28065207571 is an apocalyptic number.

28065207571 is a deficient number, since it is larger than the sum of its proper divisors (1650894581).

28065207571 is a wasteful number, since it uses less digits than its factorization.

28065207571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650894580.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 28065207571 in words is "twenty-eight billion, sixty-five million, two hundred seven thousand, five hundred seventy-one".