6812581256 has 16 divisors (see below), whose sum is σ = 13756173900. Its totient is φ = 3144268224.

The previous prime is 6812581249. The next prime is 6812581267. The reversal of 6812581256 is 6521852186.

It can be written as a sum of positive squares in 2 ways, for example, as 6713180356 + 99400900 = 81934^2 + 9970^2 .

It is a super-2 number, since 2×6812581256² = 92822526739205075072, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 32752691 + ... + 32752898.

Almost surely, 2^6812581256 is an apocalyptic number.

It is an amenable number.

6812581256 is an abundant number, since it is smaller than the sum of its proper divisors (6943592644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6812581256 is a wasteful number, since it uses less digits than its factorization.

6812581256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65505608 (or 65505604 counting only the distinct ones).

The product of its digits is 230400, while the sum is 44.

The square root of 6812581256 is about 82538.3623292830. The cubic root of 6812581256 is about 1895.7041686541.

The spelling of 6812581256 in words is "six billion, eight hundred twelve million, five hundred eighty-one thousand, two hundred fifty-six".