26327681 has 2 divisors, whose sum is σ = 26327682. Its totient is φ = 26327680.

The previous prime is 26327647. The next prime is 26327729. The reversal of 26327681 is 18672362.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22886656 + 3441025 = 4784^2 + 1855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26327681 is a prime.

It is a super-2 number, since 2×26327681² = 1386293573675522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_1643678 and since 26327681 and 1643678 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (26327281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13163840 + 13163841.

It is an arithmetic number, because the mean of its divisors is an integer number (13163841).

Almost surely, 2^26327681 is an apocalyptic number.

It is an amenable number.

26327681 is a deficient number, since it is larger than the sum of its proper divisors (1).

26327681 is an equidigital number, since it uses as much as digits as its factorization.

26327681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 26327681 is about 5131.0506721333. The cubic root of 26327681 is about 297.4889707090.

The spelling of 26327681 in words is "twenty-six million, three hundred twenty-seven thousand, six hundred eighty-one".