27689481 has 24 divisors (see below), whose sum is σ = 42690024. Its totient is φ = 17233920.

The previous prime is 27689471. The next prime is 27689483. The reversal of 27689481 is 18498672.

It can be written as a sum of positive squares in 4 ways, for example, as 15327225 + 12362256 = 3915^2 + 3516^2 .

It is not a de Polignac number, because 27689481 - 2⁵ = 27689449 is a prime.

It is a super-2 number, since 2×27689481² = 1533414716098722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27689483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20301 + ... + 21621.

It is an arithmetic number, because the mean of its divisors is an integer number (1778751).

Almost surely, 2^27689481 is an apocalyptic number.

It is an amenable number.

27689481 is a deficient number, since it is larger than the sum of its proper divisors (15000543).

27689481 is a wasteful number, since it uses less digits than its factorization.

27689481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1478 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 27689481 is about 5262.0795318961. The cubic root of 27689481 is about 302.5321997461.

The spelling of 27689481 in words is "twenty-seven million, six hundred eighty-nine thousand, four hundred eighty-one".