6400678682 has 16 divisors (see below), whose sum is σ = 10043692200. Its totient is φ = 3055261440.

The previous prime is 6400678681. The next prime is 6400678709. The reversal of 6400678682 is 2868760046.

It can be written as a sum of positive squares in 4 ways, for example, as 2662456801 + 3738221881 = 51599^2 + 61141^2 .

It is not an unprimeable number, because it can be changed into a prime (6400678681) 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 7 ways as a sum of consecutive naturals, for example, 614819 + ... + 625142.

Almost surely, 2^6400678682 is an apocalyptic number.

6400678682 is a deficient number, since it is larger than the sum of its proper divisors (3643013518).

6400678682 is a wasteful number, since it uses less digits than its factorization.

6400678682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240081.

The product of its (nonzero) digits is 774144, while the sum is 47.

The square root of 6400678682 is about 80004.2416500525. The cubic root of 6400678682 is about 1856.7011595169.

The spelling of 6400678682 in words is "six billion, four hundred million, six hundred seventy-eight thousand, six hundred eighty-two".