5681981440 has 96 divisors (see below), whose sum is σ = 13670060040. Its totient is φ = 2266693632.

The previous prime is 5681981419. The next prime is 5681981443. The reversal of 5681981440 is 441891865.

It can be written as a sum of positive squares in 4 ways, for example, as 5640610816 + 41370624 = 75104^2 + 6432^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5681981443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7505542 + ... + 7506298.

Almost surely, 2^5681981440 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 5681981440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6835030020).

5681981440 is an abundant number, since it is smaller than the sum of its proper divisors (7988078600).

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

5681981440 is an equidigital number, since it uses as much as digits as its factorization.

5681981440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517 (or 1497 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 5681981440 is about 75378.9190689280. The cubic root of 5681981440 is about 1784.4317293856.

The spelling of 5681981440 in words is "five billion, six hundred eighty-one million, nine hundred eighty-one thousand, four hundred forty".