26647997 has 2 divisors, whose sum is σ = 26647998. Its totient is φ = 26647996.

The previous prime is 26647979. The next prime is 26648009. The reversal of 26647997 is 79974662.

Together with previous prime (26647979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 10374841 = 4034^2 + 3221^2 .

It is a cyclic number.

It is not a de Polignac number, because 26647997 - 2⁸ = 26647741 is a prime.

It is a super-2 number, since 2×26647997² = 1420231488224018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26647967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13323998 + 13323999.

It is an arithmetic number, because the mean of its divisors is an integer number (13323999).

Almost surely, 2^26647997 is an apocalyptic number.

It is an amenable number.

26647997 is a deficient number, since it is larger than the sum of its proper divisors (1).

26647997 is an equidigital number, since it uses as much as digits as its factorization.

26647997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 50.

The square root of 26647997 is about 5162.1697957351. The cubic root of 26647997 is about 298.6905782157.

The spelling of 26647997 in words is "twenty-six million, six hundred forty-seven thousand, nine hundred ninety-seven".