6400007956 has 48 divisors (see below), whose sum is σ = 12170032000. Its totient is φ = 2934569088.

The previous prime is 6400007909. The next prime is 6400007963. The reversal of 6400007956 is 6597000046.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553870 + ... + 565306.

Almost surely, 2^6400007956 is an apocalyptic number.

It is an amenable number.

6400007956 is a deficient number, since it is larger than the sum of its proper divisors (5770024044).

6400007956 is a wasteful number, since it uses less digits than its factorization.

6400007956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11696 (or 11694 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 6400007956 is about 80000.0497249845. The cubic root of 6400007956 is about 1856.6363027881.

The spelling of 6400007956 in words is "six billion, four hundred million, seven thousand, nine hundred fifty-six".