27681973 has 4 divisors (see below), whose sum is σ = 30198528. Its totient is φ = 25165420.

The previous prime is 27681961. The next prime is 27682007. The reversal of 27681973 is 37918672.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27681973 - 2¹³ = 27673781 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 (27681923) 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 3 ways as a sum of consecutive naturals, for example, 1258261 + ... + 1258282.

It is an arithmetic number, because the mean of its divisors is an integer number (7549632).

Almost surely, 2^27681973 is an apocalyptic number.

It is an amenable number.

27681973 is a deficient number, since it is larger than the sum of its proper divisors (2516555).

27681973 is a wasteful number, since it uses less digits than its factorization.

27681973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516554.

The product of its digits is 127008, while the sum is 43.

The square root of 27681973 is about 5261.3660773605. The cubic root of 27681973 is about 302.5048534157.

The spelling of 27681973 in words is "twenty-seven million, six hundred eighty-one thousand, nine hundred seventy-three".