23681533440 has 320 divisors, whose sum is σ = 77611032576. Its totient is φ = 6158548992.

The previous prime is 23681533427. The next prime is 23681533459. The reversal of 23681533440 is 4433518632.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61831489 + ... + 61831871.

Almost surely, 2^23681533440 is an apocalyptic number.

23681533440 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 23681533440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38805516288).

23681533440 is an abundant number, since it is smaller than the sum of its proper divisors (53929499136).

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

23681533440 is an equidigital number, since it uses as much as digits as its factorization.

23681533440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 23681533440 in words is "twenty-three billion, six hundred eighty-one million, five hundred thirty-three thousand, four hundred forty".