26778413 has 2 divisors, whose sum is σ = 26778414. Its totient is φ = 26778412.

The previous prime is 26778377. The next prime is 26778419. The reversal of 26778413 is 31487762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20912329 + 5866084 = 4573^2 + 2422^2 .

It is a cyclic number.

It is not a de Polignac number, because 26778413 - 2¹² = 26774317 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26778419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13389206 + 13389207.

It is an arithmetic number, because the mean of its divisors is an integer number (13389207).

Almost surely, 2^26778413 is an apocalyptic number.

It is an amenable number.

26778413 is a deficient number, since it is larger than the sum of its proper divisors (1).

26778413 is an equidigital number, since it uses as much as digits as its factorization.

26778413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 38.

The square root of 26778413 is about 5174.7862757799. The cubic root of 26778413 is about 299.1770519935.

The spelling of 26778413 in words is "twenty-six million, seven hundred seventy-eight thousand, four hundred thirteen".