26648509 has 2 divisors, whose sum is σ = 26648510. Its totient is φ = 26648508.

The previous prime is 26648491. The next prime is 26648539. The reversal of 26648509 is 90584662.

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., 25220484 + 1428025 = 5022^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 26648509 - 2⁹ = 26647997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26648539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13324254 + 13324255.

It is an arithmetic number, because the mean of its divisors is an integer number (13324255).

Almost surely, 2^26648509 is an apocalyptic number.

It is an amenable number.

26648509 is a deficient number, since it is larger than the sum of its proper divisors (1).

26648509 is an equidigital number, since it uses as much as digits as its factorization.

26648509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 26648509 is about 5162.2193870466. The cubic root of 26648509 is about 298.6924911625.

The spelling of 26648509 in words is "twenty-six million, six hundred forty-eight thousand, five hundred nine".