3581805440 has 64 divisors (see below), whose sum is σ = 8577094320. Its totient is φ = 1430323200.

The previous prime is 3581805439. The next prime is 3581805467. The reversal of 3581805440 is 445081853.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 3581805394 and 3581805403.

It is a congruent number.

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, 405875 + ... + 414605.

Almost surely, 2^3581805440 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 3581805440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4288547160).

3581805440 is an abundant number, since it is smaller than the sum of its proper divisors (4995288880).

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

3581805440 is an equidigital number, since it uses as much as digits as its factorization.

3581805440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9391 (or 9379 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 3581805440 is about 59848.1866057778. The cubic root of 3581805440 is about 1530.0325281079.

The spelling of 3581805440 in words is "three billion, five hundred eighty-one million, eight hundred five thousand, four hundred forty".