27698813 has 2 divisors, whose sum is σ = 27698814. Its totient is φ = 27698812.

The previous prime is 27698809. The next prime is 27698849. The reversal of 27698813 is 31889672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27489049 + 209764 = 5243^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 27698813 - 2² = 27698809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27698893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13849406 + 13849407.

It is an arithmetic number, because the mean of its divisors is an integer number (13849407).

Almost surely, 2^27698813 is an apocalyptic number.

It is an amenable number.

27698813 is a deficient number, since it is larger than the sum of its proper divisors (1).

27698813 is an equidigital number, since it uses as much as digits as its factorization.

27698813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 27698813 is about 5262.9661788767. The cubic root of 27698813 is about 302.5661827278.

The spelling of 27698813 in words is "twenty-seven million, six hundred ninety-eight thousand, eight hundred thirteen".