26688678964 has 48 divisors (see below), whose sum is σ = 50678828928. Its totient is φ = 12251593728.

The previous prime is 26688678943. The next prime is 26688679009. The reversal of 26688678964 is 46987688662.

It is a super-2 number, since 2×26688678964² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26688678893 and 26688678902.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 440832 + ... + 497704.

It is an arithmetic number, because the mean of its divisors is an integer number (1055808936).

Almost surely, 2^26688678964 is an apocalyptic number.

It is an amenable number.

26688678964 is a deficient number, since it is larger than the sum of its proper divisors (23990149964).

26688678964 is a wasteful number, since it uses less digits than its factorization.

26688678964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57064 (or 57062 counting only the distinct ones).

The product of its digits is 334430208, while the sum is 70.

The spelling of 26688678964 in words is "twenty-six billion, six hundred eighty-eight million, six hundred seventy-eight thousand, nine hundred sixty-four".