27603981 has 12 divisors (see below), whose sum is σ = 41159040. Its totient is φ = 17808840.

The previous prime is 27603977. The next prime is 27603991. The reversal of 27603981 is 18930672.

It is not a de Polignac number, because 27603981 - 2² = 27603977 is a prime.

It is a super-2 number, since 2×27603981² = 1523959534096722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27603991) 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 11 ways as a sum of consecutive naturals, for example, 49191 + ... + 49748.

It is an arithmetic number, because the mean of its divisors is an integer number (3429920).

Almost surely, 2^27603981 is an apocalyptic number.

It is an amenable number.

27603981 is a deficient number, since it is larger than the sum of its proper divisors (13555059).

27603981 is a wasteful number, since it uses less digits than its factorization.

27603981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98976 (or 98973 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 27603981 is about 5253.9490861637. The cubic root of 27603981 is about 302.2204908520.

The spelling of 27603981 in words is "twenty-seven million, six hundred three thousand, nine hundred eighty-one".