27455661 has 18 divisors (see below), whose sum is σ = 40549262. Its totient is φ = 17901360.

The previous prime is 27455647. The next prime is 27455707. The reversal of 27455661 is 16655472.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22982436 + 4473225 = 4794^2 + 2115^2 .

It is not a de Polignac number, because 27455661 - 2⁹ = 27455149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27455611) 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 17 ways as a sum of consecutive naturals, for example, 19191 + ... + 20571.

Almost surely, 2^27455661 is an apocalyptic number.

It is an amenable number.

27455661 is a deficient number, since it is larger than the sum of its proper divisors (13093601).

27455661 is a wasteful number, since it uses less digits than its factorization.

27455661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1431 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 27455661 is about 5239.8149776495. The cubic root of 27455661 is about 301.6782276669.

The spelling of 27455661 in words is "twenty-seven million, four hundred fifty-five thousand, six hundred sixty-one".