6978660 has 96 divisors (see below), whose sum is σ = 22014720. Its totient is φ = 1638912.

The previous prime is 6978659. The next prime is 6978677. The reversal of 6978660 is 668796.

It is a happy number.

6978660 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17746 + ... + 18134.

It is an arithmetic number, because the mean of its divisors is an integer number (229320).

Almost surely, 2^6978660 is an apocalyptic number.

6978660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6978660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11007360).

6978660 is an abundant number, since it is smaller than the sum of its proper divisors (15036060).

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

6978660 is a wasteful number, since it uses less digits than its factorization.

6978660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 6978660 is about 2641.7153518122. The cubic root of 6978660 is about 191.0985301595.

The spelling of 6978660 in words is "six million, nine hundred seventy-eight thousand, six hundred sixty".