27988961 has 16 divisors (see below), whose sum is σ = 37580928. Its totient is φ = 20131200.

The previous prime is 27988943. The next prime is 27988969. The reversal of 27988961 is 16988972.

It is a cyclic number.

It is not a de Polignac number, because 27988961 - 2¹⁰ = 27987937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27988969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12980 + ... + 14981.

It is an arithmetic number, because the mean of its divisors is an integer number (2348808).

Almost surely, 2^27988961 is an apocalyptic number.

It is an amenable number.

27988961 is a deficient number, since it is larger than the sum of its proper divisors (9591967).

27988961 is a wasteful number, since it uses less digits than its factorization.

27988961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27992.

The product of its digits is 435456, while the sum is 50.

The square root of 27988961 is about 5290.4594318452. The cubic root of 27988961 is about 303.6189861021.

The spelling of 27988961 in words is "twenty-seven million, nine hundred eighty-eight thousand, nine hundred sixty-one".