27791079 has 4 divisors (see below), whose sum is σ = 37054776. Its totient is φ = 18527384.

The previous prime is 27791069. The next prime is 27791081. The reversal of 27791079 is 97019772.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27791079 - 2⁵ = 27791047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27791079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27791069) 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 in 3 ways as a sum of consecutive naturals, for example, 4631844 + ... + 4631849.

It is an arithmetic number, because the mean of its divisors is an integer number (9263694).

Almost surely, 2^27791079 is an apocalyptic number.

27791079 is a deficient number, since it is larger than the sum of its proper divisors (9263697).

27791079 is an equidigital number, since it uses as much as digits as its factorization.

27791079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9263696.

The product of its (nonzero) digits is 55566, while the sum is 42.

The square root of 27791079 is about 5271.7244806610. The cubic root of 27791079 is about 302.9017642746.

The spelling of 27791079 in words is "twenty-seven million, seven hundred ninety-one thousand, seventy-nine".