27766397 has 2 divisors, whose sum is σ = 27766398. Its totient is φ = 27766396.

The previous prime is 27766381. The next prime is 27766439. The reversal of 27766397 is 79366772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21104836 + 6661561 = 4594^2 + 2581^2 .

It is a cyclic number.

It is not a de Polignac number, because 27766397 - 2⁴ = 27766381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27766337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13883198 + 13883199.

It is an arithmetic number, because the mean of its divisors is an integer number (13883199).

Almost surely, 2^27766397 is an apocalyptic number.

It is an amenable number.

27766397 is a deficient number, since it is larger than the sum of its proper divisors (1).

27766397 is an equidigital number, since it uses as much as digits as its factorization.

27766397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 47.

The square root of 27766397 is about 5269.3829809571. The cubic root of 27766397 is about 302.8120659975.

The spelling of 27766397 in words is "twenty-seven million, seven hundred sixty-six thousand, three hundred ninety-seven".