28585857287 has 4 divisors (see below), whose sum is σ = 30784769400. Its totient is φ = 26386945176.

The previous prime is 28585857247. The next prime is 28585857331. The reversal of 28585857287 is 78275858582.

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 28585857287 - 2³² = 24290889991 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 (28585857247) 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, 1099456037 + ... + 1099456062.

It is an arithmetic number, because the mean of its divisors is an integer number (7696192350).

Almost surely, 2^28585857287 is an apocalyptic number.

28585857287 is a deficient number, since it is larger than the sum of its proper divisors (2198912113).

28585857287 is a wasteful number, since it uses less digits than its factorization.

28585857287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198912112.

The product of its digits is 100352000, while the sum is 65.

The spelling of 28585857287 in words is "twenty-eight billion, five hundred eighty-five million, eight hundred fifty-seven thousand, two hundred eighty-seven".