681743868 has 48 divisors (see below), whose sum is σ = 1723070496. Its totient is φ = 208546560.

The previous prime is 681743849. The next prime is 681743873. The reversal of 681743868 is 868347186.

681743868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 681743868.

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, 14358 + ... + 39618.

It is an arithmetic number, because the mean of its divisors is an integer number (35897302).

Almost surely, 2^681743868 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 681743868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861535248).

681743868 is an abundant number, since it is smaller than the sum of its proper divisors (1041326628).

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

681743868 is a wasteful number, since it uses less digits than its factorization.

681743868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25454 (or 25452 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 51.

The square root of 681743868 is about 26110.2253532979. The cubic root of 681743868 is about 880.1170075133.

The spelling of 681743868 in words is "six hundred eighty-one million, seven hundred forty-three thousand, eight hundred sixty-eight".