27240740645 has 4 divisors (see below), whose sum is σ = 32688888780. Its totient is φ = 21792592512.

The previous prime is 27240740641. The next prime is 27240740647. The reversal of 27240740645 is 54604704272.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13810480324 + 13430260321 = 117518^2 + 115889^2 .

It is a cyclic number.

It is not a de Polignac number, because 27240740645 - 2² = 27240740641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27240740641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2724074060 + ... + 2724074069.

It is an arithmetic number, because the mean of its divisors is an integer number (8172222195).

Almost surely, 2^27240740645 is an apocalyptic number.

It is an amenable number.

27240740645 is a deficient number, since it is larger than the sum of its proper divisors (5448148135).

27240740645 is an equidigital number, since it uses as much as digits as its factorization.

27240740645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5448148134.

The product of its (nonzero) digits is 376320, while the sum is 41.

The spelling of 27240740645 in words is "twenty-seven billion, two hundred forty million, seven hundred forty thousand, six hundred forty-five".