6856469128 has 8 divisors (see below), whose sum is σ = 12855879630. Its totient is φ = 3428234560.

The previous prime is 6856469099. The next prime is 6856469161. The reversal of 6856469128 is 8219646586.

It can be written as a sum of positive squares in only one way, i.e., 6234365764 + 622103364 = 78958^2 + 24942^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×6856469128² = 94022337806434160768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428529313 + ... + 428529328.

Almost surely, 2^6856469128 is an apocalyptic number.

It is an amenable number.

6856469128 is a deficient number, since it is larger than the sum of its proper divisors (5999410502).

6856469128 is a wasteful number, since it uses less digits than its factorization.

6856469128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857058647 (or 857058643 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 55.

The square root of 6856469128 is about 82803.7989949737. The cubic root of 6856469128 is about 1899.7662803925.

The spelling of 6856469128 in words is "six billion, eight hundred fifty-six million, four hundred sixty-nine thousand, one hundred twenty-eight".