28523641389 has 32 divisors (see below), whose sum is σ = 40938462720. Its totient is φ = 17630226432.

The previous prime is 28523641381. The next prime is 28523641463. The reversal of 28523641389 is 98314632582.

It is a happy number.

It is not a de Polignac number, because 28523641389 - 2³ = 28523641381 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28523641381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150909 + ... + 282525.

It is an arithmetic number, because the mean of its divisors is an integer number (1279326960).

Almost surely, 2^28523641389 is an apocalyptic number.

28523641389 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28523641389 is a deficient number, since it is larger than the sum of its proper divisors (12414821331).

28523641389 is a wasteful number, since it uses less digits than its factorization.

28523641389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131749.

The product of its digits is 2488320, while the sum is 51.

The spelling of 28523641389 in words is "twenty-eight billion, five hundred twenty-three million, six hundred forty-one thousand, three hundred eighty-nine".