6856328709 has 24 divisors (see below), whose sum is σ = 10058048000. Its totient is φ = 4499932320.

The previous prime is 6856328671. The next prime is 6856328723. The reversal of 6856328709 is 9078236586.

It is a happy number.

6856328709 is a `hidden beast` number, since 6 + 8 + 563 + 2 + 8 + 70 + 9 = 666.

It is not a de Polignac number, because 6856328709 - 2³¹ = 4708845061 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6856328789) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234324 + ... + 261954.

Almost surely, 2^6856328709 is an apocalyptic number.

It is an amenable number.

6856328709 is a deficient number, since it is larger than the sum of its proper divisors (3201719291).

6856328709 is a wasteful number, since it uses less digits than its factorization.

6856328709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28065 (or 28062 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The square root of 6856328709 is about 82802.9510887142. The cubic root of 6856328709 is about 1899.7533113703.

The spelling of 6856328709 in words is "six billion, eight hundred fifty-six million, three hundred twenty-eight thousand, seven hundred nine".