681305968 has 20 divisors (see below), whose sum is σ = 1508606320. Its totient is φ = 291988224.

The previous prime is 681305953. The next prime is 681306001. The reversal of 681305968 is 869503186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3041433 + ... + 3041656.

It is an arithmetic number, because the mean of its divisors is an integer number (75430316).

Almost surely, 2^681305968 is an apocalyptic number.

It is an amenable number.

681305968 is an abundant number, since it is smaller than the sum of its proper divisors (827300352).

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

681305968 is a wasteful number, since it uses less digits than its factorization.

681305968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083104 (or 6083098 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 681305968 is about 26101.8384026873. The cubic root of 681305968 is about 879.9285272531.

The spelling of 681305968 in words is "six hundred eighty-one million, three hundred five thousand, nine hundred sixty-eight".