27983681539 has 4 divisors (see below), whose sum is σ = 30527652600. Its totient is φ = 25439710480.

The previous prime is 27983681477. The next prime is 27983681567. The reversal of 27983681539 is 93518638972.

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 27983681539 - 2²⁹ = 27446810627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27983681039) 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, 1271985514 + ... + 1271985535.

It is an arithmetic number, because the mean of its divisors is an integer number (7631913150).

Almost surely, 2^27983681539 is an apocalyptic number.

27983681539 is a deficient number, since it is larger than the sum of its proper divisors (2543971061).

27983681539 is a wasteful number, since it uses less digits than its factorization.

27983681539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543971060.

The product of its digits is 19595520, while the sum is 61.

The spelling of 27983681539 in words is "twenty-seven billion, nine hundred eighty-three million, six hundred eighty-one thousand, five hundred thirty-nine".