27748397 has 2 divisors, whose sum is σ = 27748398. Its totient is φ = 27748396.

The previous prime is 27748387. The next prime is 27748421. The reversal of 27748397 is 79384772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26770276 + 978121 = 5174^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 27748397 - 2⁸ = 27748141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27748307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13874198 + 13874199.

It is an arithmetic number, because the mean of its divisors is an integer number (13874199).

Almost surely, 2^27748397 is an apocalyptic number.

It is an amenable number.

27748397 is a deficient number, since it is larger than the sum of its proper divisors (1).

27748397 is an equidigital number, since it uses as much as digits as its factorization.

27748397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704, while the sum is 47.

The square root of 27748397 is about 5267.6747242023. The cubic root of 27748397 is about 302.7466176376.

The spelling of 27748397 in words is "twenty-seven million, seven hundred forty-eight thousand, three hundred ninety-seven".