28108134509 has 96 divisors (see below), whose sum is σ = 37893918720. Its totient is φ = 20292000768.

The previous prime is 28108134503. The next prime is 28108134511. The reversal of 28108134509 is 90543180182.

It is not a de Polignac number, because 28108134509 - 2²⁴ = 28091357293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28108134503) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 172442462 + ... + 172442624.

It is an arithmetic number, because the mean of its divisors is an integer number (394728320).

Almost surely, 2^28108134509 is an apocalyptic number.

It is an amenable number.

28108134509 is a deficient number, since it is larger than the sum of its proper divisors (9785784211).

28108134509 is a wasteful number, since it uses less digits than its factorization.

28108134509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 28108134509 in words is "twenty-eight billion, one hundred eight million, one hundred thirty-four thousand, five hundred nine".