23140436788 has 72 divisors (see below), whose sum is σ = 50393249928. Its totient is φ = 9237602304.

The previous prime is 23140436783. The next prime is 23140436801. The reversal of 23140436788 is 88763404132.

It can be written as a sum of positive squares in 4 ways, for example, as 11884924324 + 11255512464 = 109018^2 + 106092^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23140436783) 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, 287406 + ... + 359002.

It is an arithmetic number, because the mean of its divisors is an integer number (699906249).

Almost surely, 2^23140436788 is an apocalyptic number.

23140436788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23140436788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25196624964).

23140436788 is an abundant number, since it is smaller than the sum of its proper divisors (27252813140).

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

23140436788 is a wasteful number, since it uses less digits than its factorization.

23140436788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71729 (or 71720 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 23140436788 in words is "twenty-three billion, one hundred forty million, four hundred thirty-six thousand, seven hundred eighty-eight".