681445320 has 64 divisors (see below), whose sum is σ = 2050254720. Its totient is φ = 181192704.

The previous prime is 681445319. The next prime is 681445343. The reversal of 681445320 is 23544186.

It is an unprimeable number.

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, 34317 + ... + 50403.

It is an arithmetic number, because the mean of its divisors is an integer number (32035230).

Almost surely, 2^681445320 is an apocalyptic number.

681445320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681445320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1025127360).

681445320 is an abundant number, since it is smaller than the sum of its proper divisors (1368809400).

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

681445320 is a wasteful number, since it uses less digits than its factorization.

681445320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16454 (or 16450 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 681445320 is about 26104.5076567247. The cubic root of 681445320 is about 879.9885156903.

The spelling of 681445320 in words is "six hundred eighty-one million, four hundred forty-five thousand, three hundred twenty".