27644022640 has 240 divisors, whose sum is σ = 75599848800. Its totient is φ = 9332692992.

The previous prime is 27644022631. The next prime is 27644022647. The reversal of 27644022640 is 4622044672.

It is a self number, because there is not a number n which added to its sum of digits gives 27644022640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27644022647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10886491 + ... + 10889029.

It is an arithmetic number, because the mean of its divisors is an integer number (314999370).

Almost surely, 2^27644022640 is an apocalyptic number.

27644022640 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 27644022640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37799924400).

27644022640 is an abundant number, since it is smaller than the sum of its proper divisors (47955826160).

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

27644022640 is a wasteful number, since it uses less digits than its factorization.

27644022640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632 (or 2607 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 37.

The spelling of 27644022640 in words is "twenty-seven billion, six hundred forty-four million, twenty-two thousand, six hundred forty".