27555945 has 16 divisors (see below), whose sum is σ = 45610560. Its totient is φ = 14189504.

The previous prime is 27555943. The next prime is 27555971. The reversal of 27555945 is 54955572.

It is a cyclic number.

It is not a de Polignac number, because 27555945 - 2¹ = 27555943 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 27555897 and 27555906.

It is not an unprimeable number, because it can be changed into a prime (27555943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31239 + ... + 32108.

It is an arithmetic number, because the mean of its divisors is an integer number (2850660).

Almost surely, 2^27555945 is an apocalyptic number.

It is an amenable number.

27555945 is a deficient number, since it is larger than the sum of its proper divisors (18054615).

27555945 is a wasteful number, since it uses less digits than its factorization.

27555945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63384.

The product of its digits is 315000, while the sum is 42.

The square root of 27555945 is about 5249.3756771639. The cubic root of 27555945 is about 302.0450826664.

The spelling of 27555945 in words is "twenty-seven million, five hundred fifty-five thousand, nine hundred forty-five".