27840961 has 4 divisors (see below), whose sum is σ = 27914800. Its totient is φ = 27767124.

The previous prime is 27840929. The next prime is 27840973. The reversal of 27840961 is 16904872.

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 27840961 - 2⁵ = 27840929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27840961.

It is not an unprimeable number, because it can be changed into a prime (27840991) 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, 36351 + ... + 37108.

It is an arithmetic number, because the mean of its divisors is an integer number (6978700).

Almost surely, 2^27840961 is an apocalyptic number.

It is an amenable number.

27840961 is a deficient number, since it is larger than the sum of its proper divisors (73839).

27840961 is an equidigital number, since it uses as much as digits as its factorization.

27840961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73838.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 27840961 is about 5276.4534490508. The cubic root of 27840961 is about 303.0828813269.

The spelling of 27840961 in words is "twenty-seven million, eight hundred forty thousand, nine hundred sixty-one".