3581578644 has 96 divisors (see below), whose sum is σ = 9736876800. Its totient is φ = 1003484160.

The previous prime is 3581578643. The next prime is 3581578703. The reversal of 3581578644 is 4468751853.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3581578643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2094862 + ... + 2096570.

It is an arithmetic number, because the mean of its divisors is an integer number (101425800).

Almost surely, 2^3581578644 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 3581578644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4868438400).

3581578644 is an abundant number, since it is smaller than the sum of its proper divisors (6155298156).

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

3581578644 is a wasteful number, since it uses less digits than its factorization.

3581578644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193 (or 2191 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 51.

The square root of 3581578644 is about 59846.2918149487. The cubic root of 3581578644 is about 1530.0002340980. Note that the first 3 decimals are identical.

The spelling of 3581578644 in words is "three billion, five hundred eighty-one million, five hundred seventy-eight thousand, six hundred forty-four".