27998868 has 12 divisors (see below), whose sum is σ = 65330720. Its totient is φ = 9332952.

The previous prime is 27998851. The next prime is 27998869. The reversal of 27998868 is 86889972.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27998869) 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 3 ways as a sum of consecutive naturals, for example, 1166608 + ... + 1166631.

Almost surely, 2^27998868 is an apocalyptic number.

It is an amenable number.

27998868 is an abundant number, since it is smaller than the sum of its proper divisors (37331852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27998868 is a wasteful number, since it uses less digits than its factorization.

27998868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333246 (or 2333244 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 57.

The square root of 27998868 is about 5291.3956571022. The cubic root of 27998868 is about 303.6548049673.

The spelling of 27998868 in words is "twenty-seven million, nine hundred ninety-eight thousand, eight hundred sixty-eight".