23118781236 has 96 divisors (see below), whose sum is σ = 57662502912. Its totient is φ = 7183933440.

The previous prime is 23118781211. The next prime is 23118781271. The reversal of 23118781236 is 63218781132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21267885 + ... + 21268971.

It is an arithmetic number, because the mean of its divisors is an integer number (600651072).

Almost surely, 2^23118781236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23118781236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28831251456).

23118781236 is an abundant number, since it is smaller than the sum of its proper divisors (34543721676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23118781236 is a wasteful number, since it uses less digits than its factorization.

23118781236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009 (or 2007 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The spelling of 23118781236 in words is "twenty-three billion, one hundred eighteen million, seven hundred eighty-one thousand, two hundred thirty-six".