681345140 has 96 divisors (see below), whose sum is σ = 1700455680. Its totient is φ = 224372736.

The previous prime is 681345113. The next prime is 681345163. The reversal of 681345140 is 41543186.

It is a junction number, because it is equal to n+sod(n) for n = 681345097 and 681345106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1148684 + ... + 1149276.

It is an arithmetic number, because the mean of its divisors is an integer number (17713080).

Almost surely, 2^681345140 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 681345140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850227840).

681345140 is an abundant number, since it is smaller than the sum of its proper divisors (1019110540).

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

681345140 is a wasteful number, since it uses less digits than its factorization.

681345140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 919 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 681345140 is about 26102.5887605042. The cubic root of 681345140 is about 879.9453908950.

The spelling of 681345140 in words is "six hundred eighty-one million, three hundred forty-five thousand, one hundred forty".