27678869 has 2 divisors, whose sum is σ = 27678870. Its totient is φ = 27678868.

The previous prime is 27678851. The next prime is 27678883. The reversal of 27678869 is 96887672.

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., 25633969 + 2044900 = 5063^2 + 1430^2 .

It is a cyclic number.

It is not a de Polignac number, because 27678869 - 2⁸ = 27678613 is a prime.

It is a super-2 number, since 2×27678869² = 1532239578238322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27678869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27677869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13839434 + 13839435.

It is an arithmetic number, because the mean of its divisors is an integer number (13839435).

Almost surely, 2^27678869 is an apocalyptic number.

It is an amenable number.

27678869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27678869 is an equidigital number, since it uses as much as digits as its factorization.

27678869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 53.

The square root of 27678869 is about 5261.0710886663. The cubic root of 27678869 is about 302.4935462958.

The spelling of 27678869 in words is "twenty-seven million, six hundred seventy-eight thousand, eight hundred sixty-nine".