27955681 has 12 divisors (see below), whose sum is σ = 31192252. Its totient is φ = 24905664.

The previous prime is 27955643. The next prime is 27955693. The reversal of 27955681 is 18655972.

It can be written as a sum of positive squares in 6 ways, for example, as 1175056 + 26780625 = 1084^2 + 5175^2 .

It is not a de Polignac number, because 27955681 - 2²¹ = 25858529 is a prime.

It is a super-2 number, since 2×27955681² = 1563040200347522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27955181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9655 + ... + 12211.

Almost surely, 2^27955681 is an apocalyptic number.

It is an amenable number.

27955681 is a deficient number, since it is larger than the sum of its proper divisors (3236571).

27955681 is a wasteful number, since it uses less digits than its factorization.

27955681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628 (or 2599 counting only the distinct ones).

The product of its digits is 151200, while the sum is 43.

The square root of 27955681 is about 5287.3132118307. The cubic root of 27955681 is about 303.4985999807.

The spelling of 27955681 in words is "twenty-seven million, nine hundred fifty-five thousand, six hundred eighty-one".