27555961 has 8 divisors (see below), whose sum is σ = 28125344. Its totient is φ = 26991360.

The previous prime is 27555943. The next prime is 27555971. The reversal of 27555961 is 16955572.

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

It is a cyclic number.

It is not a de Polignac number, because 27555961 - 2¹⁵ = 27523193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27555901) 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, 11866 + ... + 13996.

It is an arithmetic number, because the mean of its divisors is an integer number (3515668).

Almost surely, 2^27555961 is an apocalyptic number.

It is an amenable number.

27555961 is a deficient number, since it is larger than the sum of its proper divisors (569383).

27555961 is a wasteful number, since it uses less digits than its factorization.

27555961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391.

The product of its digits is 94500, while the sum is 40.

The square root of 27555961 is about 5249.3772011544. The cubic root of 27555961 is about 302.0451411259.

The spelling of 27555961 in words is "twenty-seven million, five hundred fifty-five thousand, nine hundred sixty-one".