3644540720 has 20 divisors (see below), whose sum is σ = 8473557360. Its totient is φ = 1457816256.

The previous prime is 3644540687. The next prime is 3644540747. The reversal of 3644540720 is 270454463.

3644540720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22778300 + ... + 22778459.

It is an arithmetic number, because the mean of its divisors is an integer number (423677868).

Almost surely, 2^3644540720 is an apocalyptic number.

It is an amenable number.

3644540720 is an abundant number, since it is smaller than the sum of its proper divisors (4829016640).

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

3644540720 is a wasteful number, since it uses less digits than its factorization.

3644540720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45556772 (or 45556766 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 35.

The square root of 3644540720 is about 60370.0316382226. The cubic root of 3644540720 is about 1538.9137107958.

The spelling of 3644540720 in words is "three billion, six hundred forty-four million, five hundred forty thousand, seven hundred twenty".