27645721472 has 32 divisors (see below), whose sum is σ = 55085518200. Its totient is φ = 13820336640.

The previous prime is 27645721471. The next prime is 27645721483. The reversal of 27645721472 is 27412754672.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27645721471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 824654 + ... + 857522.

Almost surely, 2^27645721472 is an apocalyptic number.

It is an amenable number.

27645721472 is a deficient number, since it is larger than the sum of its proper divisors (27439796728).

27645721472 is an equidigital number, since it uses as much as digits as its factorization.

27645721472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39454 (or 39442 counting only the distinct ones).

The product of its digits is 1317120, while the sum is 47.

The spelling of 27645721472 in words is "twenty-seven billion, six hundred forty-five million, seven hundred twenty-one thousand, four hundred seventy-two".