27990238 has 4 divisors (see below), whose sum is σ = 41985360. Its totient is φ = 13995118.

The previous prime is 27990199. The next prime is 27990247. The reversal of 27990238 is 83209972.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×27990238³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 27990238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6997558 + ... + 6997561.

It is an arithmetic number, because the mean of its divisors is an integer number (10496340).

Almost surely, 2^27990238 is an apocalyptic number.

27990238 is a deficient number, since it is larger than the sum of its proper divisors (13995122).

27990238 is a wasteful number, since it uses less digits than its factorization.

27990238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13995121.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 27990238 is about 5290.5801194198. The cubic root of 27990238 is about 303.6236035838.

The spelling of 27990238 in words is "twenty-seven million, nine hundred ninety thousand, two hundred thirty-eight".