26806948688 has 20 divisors (see below), whose sum is σ = 55933729908. Its totient is φ = 12372437760.

The previous prime is 26806948687. The next prime is 26806948691. The reversal of 26806948688 is 88684960862.

It can be written as a sum of positive squares in 2 ways, for example, as 8547372304 + 18259576384 = 92452^2 + 135128^2 .

It is a super-2 number, since 2×26806948688² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26806948687) 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 in 3 ways as a sum of consecutive naturals, for example, 64439573 + ... + 64439988.

Almost surely, 2^26806948688 is an apocalyptic number.

It is an amenable number.

26806948688 is an abundant number, since it is smaller than the sum of its proper divisors (29126781220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26806948688 is a wasteful number, since it uses less digits than its factorization.

26806948688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128879582 (or 128879576 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 65.

The spelling of 26806948688 in words is "twenty-six billion, eight hundred six million, nine hundred forty-eight thousand, six hundred eighty-eight".