27681869 has 2 divisors, whose sum is σ = 27681870. Its totient is φ = 27681868.

The previous prime is 27681859. The next prime is 27681877. The reversal of 27681869 is 96818672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18164644 + 9517225 = 4262^2 + 3085^2 .

It is a cyclic number.

It is not a de Polignac number, because 27681869 - 2¹² = 27677773 is a prime.

It is a super-2 number, since 2×27681869² = 1532571742666322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27681839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13840934 + 13840935.

It is an arithmetic number, because the mean of its divisors is an integer number (13840935).

Almost surely, 2^27681869 is an apocalyptic number.

It is an amenable number.

27681869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27681869 is an equidigital number, since it uses as much as digits as its factorization.

27681869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 27681869 is about 5261.3561939865. The cubic root of 27681869 is about 302.5044745826.

The spelling of 27681869 in words is "twenty-seven million, six hundred eighty-one thousand, eight hundred sixty-nine".