27990042172 has 12 divisors (see below), whose sum is σ = 50671628280. Its totient is φ = 13512434096.

The previous prime is 27990042169. The next prime is 27990042209. The reversal of 27990042172 is 27124009972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120646618 + ... + 120646849.

It is an arithmetic number, because the mean of its divisors is an integer number (4222635690).

Almost surely, 2^27990042172 is an apocalyptic number.

It is an amenable number.

27990042172 is a deficient number, since it is larger than the sum of its proper divisors (22681586108).

27990042172 is a wasteful number, since it uses less digits than its factorization.

27990042172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241293500 (or 241293498 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 27990042172 in words is "twenty-seven billion, nine hundred ninety million, forty-two thousand, one hundred seventy-two".