27912381247 has 4 divisors (see below), whose sum is σ = 27913168800. Its totient is φ = 27911593696.

The previous prime is 27912381191. The next prime is 27912381269. The reversal of 27912381247 is 74218321972.

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

It is a cyclic number.

It is not a de Polignac number, because 27912381247 - 2¹⁵ = 27912348479 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27912381197 and 27912381206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27912381947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337978 + ... + 412375.

It is an arithmetic number, because the mean of its divisors is an integer number (6978292200).

Almost surely, 2^27912381247 is an apocalyptic number.

27912381247 is a deficient number, since it is larger than the sum of its proper divisors (787553).

27912381247 is an equidigital number, since it uses as much as digits as its factorization.

27912381247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787552.

The product of its digits is 338688, while the sum is 46.

The spelling of 27912381247 in words is "twenty-seven billion, nine hundred twelve million, three hundred eighty-one thousand, two hundred forty-seven".