26804191688 has 32 divisors (see below), whose sum is σ = 52218027000. Its totient is φ = 12883422720.

The previous prime is 26804191657. The next prime is 26804191699. The reversal of 26804191688 is 88619140862.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26524031044 + 280160644 = 162862^2 + 16738^2 .

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 199133 + ... + 305388.

Almost surely, 2^26804191688 is an apocalyptic number.

It is an amenable number.

26804191688 is a deficient number, since it is larger than the sum of its proper divisors (25413835312).

26804191688 is a wasteful number, since it uses less digits than its factorization.

26804191688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504785 (or 504781 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 26804191688 in words is "twenty-six billion, eight hundred four million, one hundred ninety-one thousand, six hundred eighty-eight".