27999361 has 4 divisors (see below), whose sum is σ = 30153172. Its totient is φ = 25845552.

The previous prime is 27999353. The next prime is 27999371. The reversal of 27999361 is 16399972.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8814961 + 19184400 = 2969^2 + 4380^2 .

It is a cyclic number.

It is not a de Polignac number, because 27999361 - 2³ = 27999353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27999371) 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, 1076886 + ... + 1076911.

It is an arithmetic number, because the mean of its divisors is an integer number (7538293).

Almost surely, 2^27999361 is an apocalyptic number.

It is an amenable number.

27999361 is a deficient number, since it is larger than the sum of its proper divisors (2153811).

27999361 is a wasteful number, since it uses less digits than its factorization.

27999361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153810.

The product of its digits is 183708, while the sum is 46.

The square root of 27999361 is about 5291.4422419601. The cubic root of 27999361 is about 303.6565871934.

The spelling of 27999361 in words is "twenty-seven million, nine hundred ninety-nine thousand, three hundred sixty-one".