6684390 has 64 divisors (see below), whose sum is σ = 18777600. Its totient is φ = 1687392.

The previous prime is 6684373. The next prime is 6684443. The reversal of 6684390 is 934866.

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, 4479 + ... + 5781.

It is an arithmetic number, because the mean of its divisors is an integer number (293400).

Almost surely, 2^6684390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6684390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9388800).

6684390 is an abundant number, since it is smaller than the sum of its proper divisors (12093210).

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

6684390 is a wasteful number, since it uses less digits than its factorization.

6684390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1332 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6684390 is about 2585.4187281754. The cubic root of 6684390 is about 188.3738411488.

The spelling of 6684390 in words is "six million, six hundred eighty-four thousand, three hundred ninety".