23531515120 has 80 divisors (see below), whose sum is σ = 55506447360. Its totient is φ = 9276164352.

The previous prime is 23531515099. The next prime is 23531515121. The reversal of 23531515120 is 2151513532.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×23531515120² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23531515121) 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 15 ways as a sum of consecutive naturals, for example, 3706669 + ... + 3713011.

It is an arithmetic number, because the mean of its divisors is an integer number (693830592).

Almost surely, 2^23531515120 is an apocalyptic number.

23531515120 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 23531515120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27753223680).

23531515120 is an abundant number, since it is smaller than the sum of its proper divisors (31974932240).

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

23531515120 is a wasteful number, since it uses less digits than its factorization.

23531515120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7022 (or 7016 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 23531515120 in words is "twenty-three billion, five hundred thirty-one million, five hundred fifteen thousand, one hundred twenty".