23991105840 has 320 divisors, whose sum is σ = 87546396672. Its totient is φ = 5378457600.

The previous prime is 23991105833. The next prime is 23991105847. The reversal of 23991105840 is 4850119932.

It is an interprime number because it is at equal distance from previous prime (23991105833) and next prime (23991105847).

It is a junction number, because it is equal to n+sod(n) for n = 23991105792 and 23991105801.

It is not an unprimeable number, because it can be changed into a prime (23991105847) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 1636945 + ... + 1651535.

Almost surely, 2^23991105840 is an apocalyptic number.

23991105840 is a gapful number since it is divisible by the number (20) 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 23991105840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43773198336).

23991105840 is an abundant number, since it is smaller than the sum of its proper divisors (63555290832).

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

23991105840 is a wasteful number, since it uses less digits than its factorization.

23991105840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14668 (or 14662 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 23991105840 in words is "twenty-three billion, nine hundred ninety-one million, one hundred five thousand, eight hundred forty".