28550423817 has 24 divisors (see below), whose sum is σ = 42724281600. Its totient is φ = 18350263008.

The previous prime is 28550423809. The next prime is 28550423819. The reversal of 28550423817 is 71832405582.

28550423817 is a `hidden beast` number, since 28 + 550 + 42 + 38 + 1 + 7 = 666.

It is not a de Polignac number, because 28550423817 - 2³ = 28550423809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28550423819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98184 + ... + 258342.

It is an arithmetic number, because the mean of its divisors is an integer number (1780178400).

Almost surely, 2^28550423817 is an apocalyptic number.

It is an amenable number.

28550423817 is a deficient number, since it is larger than the sum of its proper divisors (14173857783).

28550423817 is a wasteful number, since it uses less digits than its factorization.

28550423817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160877 (or 160874 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 28550423817 in words is "twenty-eight billion, five hundred fifty million, four hundred twenty-three thousand, eight hundred seventeen".