27978793 has 2 divisors, whose sum is σ = 27978794. Its totient is φ = 27978792.

The previous prime is 27978791. The next prime is 27978827. The reversal of 27978793 is 39787972.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15784729 + 12194064 = 3973^2 + 3492^2 .

It is a cyclic number.

It is not a de Polignac number, because 27978793 - 2¹ = 27978791 is a prime.

Together with 27978791, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 27978793.

It is not a weakly prime, because it can be changed into another prime (27978791) 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, 13989396 + 13989397.

It is an arithmetic number, because the mean of its divisors is an integer number (13989397).

Almost surely, 2^27978793 is an apocalyptic number.

It is an amenable number.

27978793 is a deficient number, since it is larger than the sum of its proper divisors (1).

27978793 is an equidigital number, since it uses as much as digits as its factorization.

27978793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 52.

The square root of 27978793 is about 5289.4983694108. The cubic root of 27978793 is about 303.5822147982.

The spelling of 27978793 in words is "twenty-seven million, nine hundred seventy-eight thousand, seven hundred ninety-three".