23557443840 has 540 divisors, whose sum is σ = 98076084876. Its totient is φ = 5383397376.

The previous prime is 23557443781. The next prime is 23557443857. The reversal of 23557443840 is 4834475532.

23557443840 is a `hidden beast` number, since 2 + 3 + 5 + 574 + 4 + 38 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7169347584 + 16388096256 = 84672^2 + 128016^2 .

It is a tau number, because it is divible by the number of its divisors (540).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 5078002 + ... + 5082638.

Almost surely, 2^23557443840 is an apocalyptic number.

23557443840 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 23557443840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49038042438).

23557443840 is an abundant number, since it is smaller than the sum of its proper divisors (74518641036).

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

23557443840 is an equidigital number, since it uses as much as digits as its factorization.

23557443840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684 (or 4654 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 45.

The spelling of 23557443840 in words is "twenty-three billion, five hundred fifty-seven million, four hundred forty-three thousand, eight hundred forty".