27990111 has 8 divisors (see below), whose sum is σ = 37442944. Its totient is φ = 18598680.

The previous prime is 27990107. The next prime is 27990113. The reversal of 27990111 is 11109972.

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

It is not a de Polignac number, because 27990111 - 2² = 27990107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27990113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14275 + ... + 16116.

It is an arithmetic number, because the mean of its divisors is an integer number (4680368).

Almost surely, 2^27990111 is an apocalyptic number.

27990111 is a deficient number, since it is larger than the sum of its proper divisors (9452833).

27990111 is a wasteful number, since it uses less digits than its factorization.

27990111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30701.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 27990111 is about 5290.5681169417. The cubic root of 27990111 is about 303.6231443730.

The spelling of 27990111 in words is "twenty-seven million, nine hundred ninety thousand, one hundred eleven".