27748387 has 2 divisors, whose sum is σ = 27748388. Its totient is φ = 27748386.

The previous prime is 27748339. The next prime is 27748397. The reversal of 27748387 is 78384772.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27748387 is a prime.

It is a super-2 number, since 2×27748387² = 1539945962203538, which contains 22 as substring.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13874193 + 13874194.

It is an arithmetic number, because the mean of its divisors is an integer number (13874194).

Almost surely, 2^27748387 is an apocalyptic number.

27748387 is a deficient number, since it is larger than the sum of its proper divisors (1).

27748387 is an equidigital number, since it uses as much as digits as its factorization.

27748387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 526848, while the sum is 46.

The square root of 27748387 is about 5267.6737750168. The cubic root of 27748387 is about 302.7465812696.

The spelling of 27748387 in words is "twenty-seven million, seven hundred forty-eight thousand, three hundred eighty-seven".