27688429 has 2 divisors, whose sum is σ = 27688430. Its totient is φ = 27688428.

The previous prime is 27688421. The next prime is 27688447. The reversal of 27688429 is 92488672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21068100 + 6620329 = 4590^2 + 2573^2 .

It is a cyclic number.

It is not a de Polignac number, because 27688429 - 2³ = 27688421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27688421) 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, 13844214 + 13844215.

It is an arithmetic number, because the mean of its divisors is an integer number (13844215).

Almost surely, 2^27688429 is an apocalyptic number.

It is an amenable number.

27688429 is a deficient number, since it is larger than the sum of its proper divisors (1).

27688429 is an equidigital number, since it uses as much as digits as its factorization.

27688429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 27688429 is about 5261.9795704659. The cubic root of 27688429 is about 302.5283683525.

The spelling of 27688429 in words is "twenty-seven million, six hundred eighty-eight thousand, four hundred twenty-nine".