28855317847 has 4 divisors (see below), whose sum is σ = 29016520920. Its totient is φ = 28694114776.

The previous prime is 28855317839. The next prime is 28855317857. The reversal of 28855317847 is 74871355882.

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 28855317847 - 2³ = 28855317839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28855317791 and 28855317800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28855317857) 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, 80601268 + ... + 80601625.

It is an arithmetic number, because the mean of its divisors is an integer number (7254130230).

Almost surely, 2^28855317847 is an apocalyptic number.

28855317847 is a deficient number, since it is larger than the sum of its proper divisors (161203073).

28855317847 is a wasteful number, since it uses less digits than its factorization.

28855317847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161203072.

The product of its digits is 15052800, while the sum is 58.

The spelling of 28855317847 in words is "twenty-eight billion, eight hundred fifty-five million, three hundred seventeen thousand, eight hundred forty-seven".