27989990939 has 4 divisors (see below), whose sum is σ = 28024084320. Its totient is φ = 27955897560.

The previous prime is 27989990933. The next prime is 27989990947. The reversal of 27989990939 is 93909998972.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27989990939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27989990933) 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, 17045459 + ... + 17047100.

It is an arithmetic number, because the mean of its divisors is an integer number (7006021080).

Almost surely, 2^27989990939 is an apocalyptic number.

27989990939 is a deficient number, since it is larger than the sum of its proper divisors (34093381).

27989990939 is an equidigital number, since it uses as much as digits as its factorization.

27989990939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34093380.

The product of its (nonzero) digits is 178564176, while the sum is 74.

The spelling of 27989990939 in words is "twenty-seven billion, nine hundred eighty-nine million, nine hundred ninety thousand, nine hundred thirty-nine".