681406680 has 64 divisors (see below), whose sum is σ = 2046332160. Its totient is φ = 181520768.

The previous prime is 681406669. The next prime is 681406703. The reversal of 681406680 is 86604186.

681406680 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144439 + ... + 149081.

It is an arithmetic number, because the mean of its divisors is an integer number (31973940).

Almost surely, 2^681406680 is an apocalyptic number.

681406680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681406680 is an abundant number, since it is smaller than the sum of its proper divisors (1364925480).

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

681406680 is a wasteful number, since it uses less digits than its factorization.

681406680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5880 (or 5876 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 681406680 is about 26103.7675441688. The cubic root of 681406680 is about 879.9718827104.

The spelling of 681406680 in words is "six hundred eighty-one million, four hundred six thousand, six hundred eighty".