26688281 has 2 divisors, whose sum is σ = 26688282. Its totient is φ = 26688280.

The previous prime is 26688229. The next prime is 26688301. The reversal of 26688281 is 18288662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23232400 + 3455881 = 4820^2 + 1859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26688281 is a prime.

It is a super-2 number, since 2×26688281² = 1424528685469922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26687281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13344140 + 13344141.

It is an arithmetic number, because the mean of its divisors is an integer number (13344141).

Almost surely, 2^26688281 is an apocalyptic number.

It is an amenable number.

26688281 is a deficient number, since it is larger than the sum of its proper divisors (1).

26688281 is an equidigital number, since it uses as much as digits as its factorization.

26688281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 41.

The square root of 26688281 is about 5166.0701698680. The cubic root of 26688281 is about 298.8410134517.

The spelling of 26688281 in words is "twenty-six million, six hundred eighty-eight thousand, two hundred eighty-one".