27664943 has 2 divisors, whose sum is σ = 27664944. Its totient is φ = 27664942.

The previous prime is 27664939. The next prime is 27664951. The reversal of 27664943 is 34946672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27664943 - 2² = 27664939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27664943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27664243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13832471 + 13832472.

It is an arithmetic number, because the mean of its divisors is an integer number (13832472).

Almost surely, 2^27664943 is an apocalyptic number.

27664943 is a deficient number, since it is larger than the sum of its proper divisors (1).

27664943 is an equidigital number, since it uses as much as digits as its factorization.

27664943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 41.

The square root of 27664943 is about 5259.7474273961. The cubic root of 27664943 is about 302.4428068454.

The spelling of 27664943 in words is "twenty-seven million, six hundred sixty-four thousand, nine hundred forty-three".