28265808875567 has 4 divisors (see below), whose sum is σ = 28540234204560. Its totient is φ = 27991383546576.

The previous prime is 28265808875561. The next prime is 28265808875587. The reversal of 28265808875567 is 76557880856282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28265808875567 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 (28265808875561) 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, 137212664342 + ... + 137212664547.

It is an arithmetic number, because the mean of its divisors is an integer number (7135058551140).

Almost surely, 2^{28265808875567} is an apocalyptic number.

28265808875567 is a deficient number, since it is larger than the sum of its proper divisors (274425328993).

28265808875567 is a wasteful number, since it uses less digits than its factorization.

28265808875567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274425328992.

The product of its (nonzero) digits is 3612672000, while the sum is 77.

The spelling of 28265808875567 in words is "twenty-eight trillion, two hundred sixty-five billion, eight hundred eight million, eight hundred seventy-five thousand, five hundred sixty-seven".