23531201540 has 192 divisors, whose sum is σ = 63815689728. Its totient is φ = 7134082560.

The previous prime is 23531201539. The next prime is 23531201549. The reversal of 23531201540 is 4510213532.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (23531201549) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6892874 + ... + 6896286.

It is an arithmetic number, because the mean of its divisors is an integer number (332373384).

Almost surely, 2^23531201540 is an apocalyptic number.

23531201540 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 23531201540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31907844864).

23531201540 is an abundant number, since it is smaller than the sum of its proper divisors (40284488188).

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

23531201540 is a wasteful number, since it uses less digits than its factorization.

23531201540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499 (or 3475 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 23531201540 in words is "twenty-three billion, five hundred thirty-one million, two hundred one thousand, five hundred forty".