27989990938 has 16 divisors (see below), whose sum is σ = 51673829760. Its totient is φ = 11072963376.

The previous prime is 27989990933. The next prime is 27989990947. The reversal of 27989990938 is 83909998972.

It is not an unprimeable number, because it can be changed into a prime (27989990933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76895398 + ... + 76895761.

It is an arithmetic number, because the mean of its divisors is an integer number (3229614360).

Almost surely, 2^27989990938 is an apocalyptic number.

27989990938 is a deficient number, since it is larger than the sum of its proper divisors (23683838822).

27989990938 is a wasteful number, since it uses less digits than its factorization.

27989990938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153791181.

The product of its (nonzero) digits is 158723712, while the sum is 73.

The spelling of 27989990938 in words is "twenty-seven billion, nine hundred eighty-nine million, nine hundred ninety thousand, nine hundred thirty-eight".