27965621 has 2 divisors, whose sum is σ = 27965622. Its totient is φ = 27965620.

The previous prime is 27965593. The next prime is 27965659. The reversal of 27965621 is 12656972.

It is a happy number.

It is an a-pointer prime, because the next prime (27965659) can be obtained adding 27965621 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27772900 + 192721 = 5270^2 + 439^2 .

It is a cyclic number.

It is not a de Polignac number, because 27965621 - 2⁶ = 27965557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27965521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13982810 + 13982811.

It is an arithmetic number, because the mean of its divisors is an integer number (13982811).

Almost surely, 2^27965621 is an apocalyptic number.

It is an amenable number.

27965621 is a deficient number, since it is larger than the sum of its proper divisors (1).

27965621 is an equidigital number, since it uses as much as digits as its factorization.

27965621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 27965621 is about 5288.2531142146. The cubic root of 27965621 is about 303.5345666548.

The spelling of 27965621 in words is "twenty-seven million, nine hundred sixty-five thousand, six hundred twenty-one".