26778419 has 2 divisors, whose sum is σ = 26778420. Its totient is φ = 26778418.

The previous prime is 26778413. The next prime is 26778449. The reversal of 26778419 is 91487762.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26778419 - 2¹⁶ = 26712883 is a prime.

It is a super-2 number, since 2×26778419² = 1434167448279122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26778419.

It is not a weakly prime, because it can be changed into another prime (26778413) 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, 13389209 + 13389210.

It is an arithmetic number, because the mean of its divisors is an integer number (13389210).

Almost surely, 2^26778419 is an apocalyptic number.

26778419 is a deficient number, since it is larger than the sum of its proper divisors (1).

26778419 is an equidigital number, since it uses as much as digits as its factorization.

26778419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 26778419 is about 5174.7868555140. The cubic root of 26778419 is about 299.1770743382.

The spelling of 26778419 in words is "twenty-six million, seven hundred seventy-eight thousand, four hundred nineteen".