6887756864 has 28 divisors (see below), whose sum is σ = 13724636508. Its totient is φ = 3429580800.

The previous prime is 6887756849. The next prime is 6887756923. The reversal of 6887756864 is 4686577886.

It can be written as a sum of positive squares in 2 ways, for example, as 4716942400 + 2170814464 = 68680^2 + 46592^2 .

It is a super-2 number, since 2×6887756864² = 94882389235158228992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6887756864.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207857 + ... + 238704.

Almost surely, 2^6887756864 is an apocalyptic number.

6887756864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6887756864 is a deficient number, since it is larger than the sum of its proper divisors (6836879644).

6887756864 is a wasteful number, since it uses less digits than its factorization.

6887756864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446814 (or 446804 counting only the distinct ones).

The product of its digits is 108380160, while the sum is 65.

The square root of 6887756864 is about 82992.5108910437. The cubic root of 6887756864 is about 1902.6515945449.

The spelling of 6887756864 in words is "six billion, eight hundred eighty-seven million, seven hundred fifty-six thousand, eight hundred sixty-four".