27992813 has 2 divisors, whose sum is σ = 27992814. Its totient is φ = 27992812.

The previous prime is 27992773. The next prime is 27992819. The reversal of 27992813 is 31829972.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26245129 + 1747684 = 5123^2 + 1322^2 .

It is a cyclic number.

It is not a de Polignac number, because 27992813 - 2⁶ = 27992749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27992819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13996406 + 13996407.

It is an arithmetic number, because the mean of its divisors is an integer number (13996407).

Almost surely, 2^27992813 is an apocalyptic number.

It is an amenable number.

27992813 is a deficient number, since it is larger than the sum of its proper divisors (1).

27992813 is an equidigital number, since it uses as much as digits as its factorization.

27992813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 27992813 is about 5290.8234708786. The cubic root of 27992813 is about 303.6329140537.

The spelling of 27992813 in words is "twenty-seven million, nine hundred ninety-two thousand, eight hundred thirteen".