27988895 has 16 divisors (see below), whose sum is σ = 36937728. Its totient is φ = 20190240.

The previous prime is 27988889. The next prime is 27988903. The reversal of 27988895 is 59888972.

It is not a de Polignac number, because 27988895 - 2⁴ = 27988879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27988895.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4982 + ... + 8988.

It is an arithmetic number, because the mean of its divisors is an integer number (2308608).

Almost surely, 2^27988895 is an apocalyptic number.

27988895 is a deficient number, since it is larger than the sum of its proper divisors (8948833).

27988895 is a wasteful number, since it uses less digits than its factorization.

27988895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4150.

The product of its digits is 2903040, while the sum is 56.

The square root of 27988895 is about 5290.4531941980. The cubic root of 27988895 is about 303.6187474500.

It can be divided in two parts, 2 and 7988895, that added together give a palindrome (7988897).

The spelling of 27988895 in words is "twenty-seven million, nine hundred eighty-eight thousand, eight hundred ninety-five".