27916639 has 2 divisors, whose sum is σ = 27916640. Its totient is φ = 27916638.

The previous prime is 27916631. The next prime is 27916663. The reversal of 27916639 is 93661972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27916639 - 2³ = 27916631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27916595 and 27916604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27916631) 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, 13958319 + 13958320.

It is an arithmetic number, because the mean of its divisors is an integer number (13958320).

Almost surely, 2^27916639 is an apocalyptic number.

27916639 is a deficient number, since it is larger than the sum of its proper divisors (1).

27916639 is an equidigital number, since it uses as much as digits as its factorization.

27916639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 43.

The square root of 27916639 is about 5283.6198765619. The cubic root of 27916639 is about 303.3572487149.

The spelling of 27916639 in words is "twenty-seven million, nine hundred sixteen thousand, six hundred thirty-nine".