27781607441 has 4 divisors (see below), whose sum is σ = 31750408512. Its totient is φ = 23812806372.

The previous prime is 27781607389. The next prime is 27781607453. The reversal of 27781607441 is 14470618772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27781607441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27781607941) 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, 1984400525 + ... + 1984400538.

It is an arithmetic number, because the mean of its divisors is an integer number (7937602128).

Almost surely, 2^27781607441 is an apocalyptic number.

It is an amenable number.

27781607441 is a deficient number, since it is larger than the sum of its proper divisors (3968801071).

27781607441 is an equidigital number, since it uses as much as digits as its factorization.

27781607441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968801070.

The product of its (nonzero) digits is 526848, while the sum is 47.

The spelling of 27781607441 in words is "twenty-seven billion, seven hundred eighty-one million, six hundred seven thousand, four hundred forty-one".