27649138479 has 4 divisors (see below), whose sum is σ = 36865517976. Its totient is φ = 18432758984.

The previous prime is 27649138463. The next prime is 27649138507. The reversal of 27649138479 is 97483194672.

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 27649138479 - 2⁴ = 27649138463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27649138679) 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, 4608189744 + ... + 4608189749.

It is an arithmetic number, because the mean of its divisors is an integer number (9216379494).

Almost surely, 2^27649138479 is an apocalyptic number.

27649138479 is a deficient number, since it is larger than the sum of its proper divisors (9216379497).

27649138479 is an equidigital number, since it uses as much as digits as its factorization.

27649138479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9216379496.

The product of its digits is 18289152, while the sum is 60.

The spelling of 27649138479 in words is "twenty-seven billion, six hundred forty-nine million, one hundred thirty-eight thousand, four hundred seventy-nine".