27640481 has 4 divisors (see below), whose sum is σ = 30153264. Its totient is φ = 25127700.

The previous prime is 27640471. The next prime is 27640493. The reversal of 27640481 is 18404672.

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 a de Polignac number, because none of the positive numbers 2^k-27640481 is a prime.

It is a super-2 number, since 2×27640481² = 1527992379822722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27640471) 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, 1256375 + ... + 1256396.

It is an arithmetic number, because the mean of its divisors is an integer number (7538316).

Almost surely, 2^27640481 is an apocalyptic number.

It is an amenable number.

27640481 is a deficient number, since it is larger than the sum of its proper divisors (2512783).

27640481 is a wasteful number, since it uses less digits than its factorization.

27640481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512782.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 27640481 is about 5257.4215162948. The cubic root of 27640481 is about 302.3536381864.

The spelling of 27640481 in words is "twenty-seven million, six hundred forty thousand, four hundred eighty-one".