27691956 has 30 divisors (see below), whose sum is σ = 72393090. Its totient is φ = 9230544.

The previous prime is 27691927. The next prime is 27691973. The reversal of 27691956 is 65919672.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 27248400 + 443556 = 5220^2 + 666^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 42411 + ... + 43058.

It is an arithmetic number, because the mean of its divisors is an integer number (2413103).

Almost surely, 2^27691956 is an apocalyptic number.

It is an amenable number.

27691956 is an abundant number, since it is smaller than the sum of its proper divisors (44701134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27691956 is a wasteful number, since it uses less digits than its factorization.

27691956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85485 (or 85474 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 27691956 is about 5262.3146998255. The cubic root of 27691956 is about 302.5412133361.

The spelling of 27691956 in words is "twenty-seven million, six hundred ninety-one thousand, nine hundred fifty-six".