6878721 has 8 divisors (see below), whose sum is σ = 9275040. Its totient is φ = 4534112.

The previous prime is 6878699. The next prime is 6878731. The reversal of 6878721 is 1278786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6878721 - 2⁶ = 6878657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6878721.

It is not an unprimeable number, because it can be changed into a prime (6878731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12615 + ... + 13148.

It is an arithmetic number, because the mean of its divisors is an integer number (1159380).

Almost surely, 2^6878721 is an apocalyptic number.

It is an amenable number.

6878721 is a deficient number, since it is larger than the sum of its proper divisors (2396319).

6878721 is a wasteful number, since it uses less digits than its factorization.

6878721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25855.

The product of its digits is 37632, while the sum is 39.

The square root of 6878721 is about 2622.7315912994. The cubic root of 6878721 is about 190.1819217869.

The spelling of 6878721 in words is "six million, eight hundred seventy-eight thousand, seven hundred twenty-one".