681381344 has 96 divisors (see below), whose sum is σ = 1657797120. Its totient is φ = 269111808.

The previous prime is 681381341. The next prime is 681381353. The reversal of 681381344 is 443183186.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 681381298 and 681381307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681381341) 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, 155309 + ... + 159635.

It is an arithmetic number, because the mean of its divisors is an integer number (17268720).

Almost surely, 2^681381344 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 681381344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (828898560).

681381344 is an abundant number, since it is smaller than the sum of its proper divisors (976415776).

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

681381344 is a wasteful number, since it uses less digits than its factorization.

681381344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400 (or 4392 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 681381344 is about 26103.2822457253. The cubic root of 681381344 is about 879.9609762309.

The spelling of 681381344 in words is "six hundred eighty-one million, three hundred eighty-one thousand, three hundred forty-four".