27661603 has 4 divisors (see below), whose sum is σ = 27685000. Its totient is φ = 27638208.

The previous prime is 27661591. The next prime is 27661631. The reversal of 27661603 is 30616672.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27661603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27661643) 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 in 3 ways as a sum of consecutive naturals, for example, 9825 + ... + 12322.

It is an arithmetic number, because the mean of its divisors is an integer number (6921250).

Almost surely, 2^27661603 is an apocalyptic number.

27661603 is a deficient number, since it is larger than the sum of its proper divisors (23397).

27661603 is a wasteful number, since it uses less digits than its factorization.

27661603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23396.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 27661603 is about 5259.4299120722. The cubic root of 27661603 is about 302.4306350072.

The spelling of 27661603 in words is "twenty-seven million, six hundred sixty-one thousand, six hundred three".