681934848 has 128 divisors (see below), whose sum is σ = 2080343040. Its totient is φ = 194641920.

The previous prime is 681934823. The next prime is 681934859. The reversal of 681934848 is 848439186.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 681934848.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687633 + ... + 688623.

It is an arithmetic number, because the mean of its divisors is an integer number (16252680).

Almost surely, 2^681934848 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 681934848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1040171520).

681934848 is an abundant number, since it is smaller than the sum of its proper divisors (1398408192).

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

681934848 is an frugal number, since it uses more digits than its factorization.

681934848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031 (or 1003 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 51.

The square root of 681934848 is about 26113.8822850989. The cubic root of 681934848 is about 880.1991835625.

The spelling of 681934848 in words is "six hundred eighty-one million, nine hundred thirty-four thousand, eight hundred forty-eight".