27678121 has 3 divisors (see below), whose sum is σ = 27683383. Its totient is φ = 27672860.

The previous prime is 27678103. The next prime is 27678163. The reversal of 27678121 is 12187672.

It is a happy number.

The square root of 27678121 is 5261.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 20602521 + 7075600 = 4539^2 + 2660^2 .

It is not a de Polignac number, because 27678121 - 2⁵ = 27678089 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27678181) 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 2 ways as a sum of consecutive naturals, for example, 2631 + ... + 7891.

Almost surely, 2^27678121 is an apocalyptic number.

27678121 is the 5261-st square number.

27678121 is the 2631-st centered octagonal number.

It is an amenable number.

27678121 is a deficient number, since it is larger than the sum of its proper divisors (5262).

27678121 is an frugal number, since it uses more digits than its factorization.

27678121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10522 (or 5261 counting only the distinct ones).

The product of its digits is 9408, while the sum is 34.

The cubic root of 27678121 is about 302.4908213867.

The spelling of 27678121 in words is "twenty-seven million, six hundred seventy-eight thousand, one hundred twenty-one".