27678561 has 8 divisors (see below), whose sum is σ = 37601280. Its totient is φ = 18104112.

The previous prime is 27678527. The next prime is 27678577. The reversal of 27678561 is 16587672.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27678561 - 2¹⁰ = 27677537 is a prime.

It is a super-2 number, since 2×27678561² = 1532205478061442, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (27678061) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 86881 + ... + 87198.

It is an arithmetic number, because the mean of its divisors is an integer number (4700160).

Almost surely, 2^27678561 is an apocalyptic number.

It is an amenable number.

27678561 is a deficient number, since it is larger than the sum of its proper divisors (9922719).

27678561 is a wasteful number, since it uses less digits than its factorization.

27678561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174135.

The product of its digits is 141120, while the sum is 42.

The square root of 27678561 is about 5261.0418169788. The cubic root of 27678561 is about 302.4924242804.

The spelling of 27678561 in words is "twenty-seven million, six hundred seventy-eight thousand, five hundred sixty-one".