27907813 has 2 divisors, whose sum is σ = 27907814. Its totient is φ = 27907812.

The previous prime is 27907811. The next prime is 27907853. The reversal of 27907813 is 31870972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15069924 + 12837889 = 3882^2 + 3583^2 .

It is a cyclic number.

It is not a de Polignac number, because 27907813 - 2¹ = 27907811 is a prime.

Together with 27907811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27907811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13953906 + 13953907.

It is an arithmetic number, because the mean of its divisors is an integer number (13953907).

Almost surely, 2^27907813 is an apocalyptic number.

It is an amenable number.

27907813 is a deficient number, since it is larger than the sum of its proper divisors (1).

27907813 is an equidigital number, since it uses as much as digits as its factorization.

27907813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 27907813 is about 5282.7845876962. The cubic root of 27907813 is about 303.3252759872.

The spelling of 27907813 in words is "twenty-seven million, nine hundred seven thousand, eight hundred thirteen".