27243021568 has 108 divisors (see below), whose sum is σ = 63548123520. Its totient is φ = 11622030336.

The previous prime is 27243021437. The next prime is 27243021583. The reversal of 27243021568 is 86512034272.

It is a self number, because there is not a number n which added to its sum of digits gives 27243021568.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2792443 + ... + 2802181.

Almost surely, 2^27243021568 is an apocalyptic number.

27243021568 is a gapful number since it is divisible by the number (28) 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 27243021568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31774061760).

27243021568 is an abundant number, since it is smaller than the sum of its proper divisors (36305101952).

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

27243021568 is an equidigital number, since it uses as much as digits as its factorization.

27243021568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9992 (or 9971 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 27243021568 in words is "twenty-seven billion, two hundred forty-three million, twenty-one thousand, five hundred sixty-eight".