681568830 has 96 divisors (see below), whose sum is σ = 1882808928. Its totient is φ = 177292800.

The previous prime is 681568829. The next prime is 681568861. The reversal of 681568830 is 38865186.

681568830 is a `hidden beast` number, since 6 + 8 + 1 + 568 + 83 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96210 + ... + 103050.

It is an arithmetic number, because the mean of its divisors is an integer number (19612593).

Almost surely, 2^681568830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681568830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (941404464).

681568830 is an abundant number, since it is smaller than the sum of its proper divisors (1201240098).

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

681568830 is a wasteful number, since it uses less digits than its factorization.

681568830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6904 (or 6892 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 681568830 is about 26106.8732329247. The cubic root of 681568830 is about 880.0416776060.

The spelling of 681568830 in words is "six hundred eighty-one million, five hundred sixty-eight thousand, eight hundred thirty".