27968651 has 4 divisors (see below), whose sum is σ = 27980232. Its totient is φ = 27957072.

The previous prime is 27968609. The next prime is 27968653. The reversal of 27968651 is 15686972.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27968651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27968653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641 + ... + 7506.

It is an arithmetic number, because the mean of its divisors is an integer number (6995058).

Almost surely, 2^27968651 is an apocalyptic number.

27968651 is a deficient number, since it is larger than the sum of its proper divisors (11581).

27968651 is an equidigital number, since it uses as much as digits as its factorization.

27968651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11580.

The product of its digits is 181440, while the sum is 44.

The square root of 27968651 is about 5288.5395904730. The cubic root of 27968651 is about 303.5455286442.

The spelling of 27968651 in words is "twenty-seven million, nine hundred sixty-eight thousand, six hundred fifty-one".