681313344 has 56 divisors (see below), whose sum is σ = 1816900608. Its totient is φ = 225308160.

The previous prime is 681313313. The next prime is 681313361. The reversal of 681313344 is 443313186.

681313344 = 127² + 128² + ... + 1269².

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10414 + ... + 38354.

Almost surely, 2^681313344 is an apocalyptic number.

681313344 is a gapful number since it is divisible by the number (64) 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 681313344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (908450304).

681313344 is an abundant number, since it is smaller than the sum of its proper divisors (1135587264).

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

681313344 is a wasteful number, since it uses less digits than its factorization.

681313344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28083 (or 28073 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 681313344 is about 26101.9796950346. The cubic root of 681313344 is about 879.9317026885.

The spelling of 681313344 in words is "six hundred eighty-one million, three hundred thirteen thousand, three hundred forty-four".