6921680 has 40 divisors (see below), whose sum is σ = 16617984. Its totient is φ = 2678400.

The previous prime is 6921671. The next prime is 6921709. The reversal of 6921680 is 861296.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1085 + ... + 3875.

Almost surely, 2^6921680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6921680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8308992).

6921680 is an abundant number, since it is smaller than the sum of its proper divisors (9696304).

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

6921680 is a wasteful number, since it uses less digits than its factorization.

6921680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835 (or 2829 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 6921680 is about 2630.9085883018. The cubic root of 6921680 is about 190.5770086122.

It can be divided in two parts, 69216 and 80, that added together give a palindrome (69296).

The spelling of 6921680 in words is "six million, nine hundred twenty-one thousand, six hundred eighty".