27561634 has 4 divisors (see below), whose sum is σ = 41342454. Its totient is φ = 13780816.

The previous prime is 27561619. The next prime is 27561637. The reversal of 27561634 is 43616572.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27531009 + 30625 = 5247^2 + 175^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 27561634.

It is not an unprimeable number, because it can be changed into a prime (27561637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6890407 + ... + 6890410.

Almost surely, 2^27561634 is an apocalyptic number.

27561634 is a deficient number, since it is larger than the sum of its proper divisors (13780820).

27561634 is a wasteful number, since it uses less digits than its factorization.

27561634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13780819.

The product of its digits is 30240, while the sum is 34.

The square root of 27561634 is about 5249.9175231617. The cubic root of 27561634 is about 302.0658672465.

Subtracting from 27561634 its sum of digits (34), we obtain a triangular number (27561600 = T₇₄₂₄).

The spelling of 27561634 in words is "twenty-seven million, five hundred sixty-one thousand, six hundred thirty-four".