27898161 has 4 divisors (see below), whose sum is σ = 37197552. Its totient is φ = 18598772.

The previous prime is 27898159. The next prime is 27898187. The reversal of 27898161 is 16189872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27898161 - 2¹ = 27898159 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (27898141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4649691 + ... + 4649696.

It is an arithmetic number, because the mean of its divisors is an integer number (9299388).

Almost surely, 2^27898161 is an apocalyptic number.

It is an amenable number.

27898161 is a deficient number, since it is larger than the sum of its proper divisors (9299391).

27898161 is an equidigital number, since it uses as much as digits as its factorization.

27898161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9299390.

The product of its digits is 48384, while the sum is 42.

The square root of 27898161 is about 5281.8709753268. The cubic root of 27898161 is about 303.2903033059.

The spelling of 27898161 in words is "twenty-seven million, eight hundred ninety-eight thousand, one hundred sixty-one".