27881289 has 6 divisors (see below), whose sum is σ = 40272986. Its totient is φ = 18587520.

The previous prime is 27881279. The next prime is 27881291. The reversal of 27881289 is 98218872.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 24206400 + 3674889 = 4920^2 + 1917^2 .

It is not a de Polignac number, because 27881289 - 2⁵ = 27881257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27881279) 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, 1548952 + ... + 1548969.

Almost surely, 2^27881289 is an apocalyptic number.

It is an amenable number.

27881289 is a deficient number, since it is larger than the sum of its proper divisors (12391697).

27881289 is a wasteful number, since it uses less digits than its factorization.

27881289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097927 (or 3097924 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 27881289 is about 5280.2735724582. The cubic root of 27881289 is about 303.2291505785.

The spelling of 27881289 in words is "twenty-seven million, eight hundred eighty-one thousand, two hundred eighty-nine".