6685309904 has 360 divisors, whose sum is σ = 18096341760. Its totient is φ = 2366267904.

The previous prime is 6685309901. The next prime is 6685309913. The reversal of 6685309904 is 4099035866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6685309901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 84624137 + ... + 84624215.

It is an arithmetic number, because the mean of its divisors is an integer number (50267616).

Almost surely, 2^6685309904 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 6685309904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9048170880).

6685309904 is an abundant number, since it is smaller than the sum of its proper divisors (11411031856).

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

6685309904 is a wasteful number, since it uses less digits than its factorization.

6685309904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 50.

The square root of 6685309904 is about 81763.7444348044. The cubic root of 6685309904 is about 1883.8248207198.

The spelling of 6685309904 in words is "six billion, six hundred eighty-five million, three hundred nine thousand, nine hundred four".