681322872 has 64 divisors (see below), whose sum is σ = 1815609600. Its totient is φ = 212313600.

The previous prime is 681322853. The next prime is 681322879. The reversal of 681322872 is 278223186.

It is a self number, because there is not a number n which added to its sum of digits gives 681322872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681322879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56079 + ... + 67137.

It is an arithmetic number, because the mean of its divisors is an integer number (28368900).

Almost surely, 2^681322872 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 681322872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907804800).

681322872 is an abundant number, since it is smaller than the sum of its proper divisors (1134286728).

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

681322872 is a wasteful number, since it uses less digits than its factorization.

681322872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11236 (or 11232 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 681322872 is about 26102.1622092883. The cubic root of 681322872 is about 879.9358045457.

The spelling of 681322872 in words is "six hundred eighty-one million, three hundred twenty-two thousand, eight hundred seventy-two".