27980161 has 6 divisors (see below), whose sum is σ = 30755186. Its totient is φ = 25436400.

The previous prime is 27980153. The next prime is 27980201. The reversal of 27980161 is 16108972.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 101761 = 5280^2 + 319^2 .

It is not a de Polignac number, because 27980161 - 2³ = 27980153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27980111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115500 + ... + 115741.

Almost surely, 2^27980161 is an apocalyptic number.

It is an amenable number.

27980161 is a deficient number, since it is larger than the sum of its proper divisors (2775025).

27980161 is a wasteful number, since it uses less digits than its factorization.

27980161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231263 (or 231252 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 27980161 is about 5289.6276806596. The cubic root of 27980161 is about 303.5871625182.

The spelling of 27980161 in words is "twenty-seven million, nine hundred eighty thousand, one hundred sixty-one".