27998538 has 8 divisors (see below), whose sum is σ = 55997088. Its totient is φ = 9332844.

The previous prime is 27998527. The next prime is 27998557. The reversal of 27998538 is 83589972.

It is a sphenic number, since it is the product of 3 distinct primes.

27998538 is an admirable number.

It is an unprimeable number.

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, 2333206 + ... + 2333217.

It is an arithmetic number, because the mean of its divisors is an integer number (6999636).

Almost surely, 2^27998538 is an apocalyptic number.

27998538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

27998538 is a wasteful number, since it uses less digits than its factorization.

27998538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4666428.

The product of its digits is 1088640, while the sum is 51.

The square root of 27998538 is about 5291.3644743110. The cubic root of 27998538 is about 303.6536119848.

The spelling of 27998538 in words is "twenty-seven million, nine hundred ninety-eight thousand, five hundred thirty-eight".