26390786409 has 24 divisors (see below), whose sum is σ = 41093691912. Its totient is φ = 16224122880.

The previous prime is 26390786399. The next prime is 26390786437. The reversal of 26390786409 is 90468709362.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6845907600 + 19544878809 = 82740^2 + 139803^2 .

It is not a de Polignac number, because 26390786409 - 2²⁸ = 26122350953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26390786449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3529 + ... + 229769.

It is an arithmetic number, because the mean of its divisors is an integer number (1712237163).

Almost surely, 2^26390786409 is an apocalyptic number.

It is an amenable number.

26390786409 is a deficient number, since it is larger than the sum of its proper divisors (14702905503).

26390786409 is a wasteful number, since it uses less digits than its factorization.

26390786409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227257 (or 227254 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 26390786409 in words is "twenty-six billion, three hundred ninety million, seven hundred eighty-six thousand, four hundred nine".