6878729 has 12 divisors (see below), whose sum is σ = 8144388. Its totient is φ = 5771040.

The previous prime is 6878699. The next prime is 6878731. The reversal of 6878729 is 9278786.

It can be written as a sum of positive squares in 2 ways, for example, as 2371600 + 4507129 = 1540^2 + 2123^2 .

It is not a de Polignac number, because 6878729 - 2¹² = 6874633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6878749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 614 + ... + 3759.

It is an arithmetic number, because the mean of its divisors is an integer number (678699).

Almost surely, 2^6878729 is an apocalyptic number.

It is an amenable number.

6878729 is a deficient number, since it is larger than the sum of its proper divisors (1265659).

6878729 is a wasteful number, since it uses less digits than its factorization.

6878729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4408 (or 4397 counting only the distinct ones).

The product of its digits is 338688, while the sum is 47.

The square root of 6878729 is about 2622.7331164265. The cubic root of 6878729 is about 190.1819955145.

The spelling of 6878729 in words is "six million, eight hundred seventy-eight thousand, seven hundred twenty-nine".