3643995672 has 24 divisors (see below), whose sum is σ = 9869155140. Its totient is φ = 1214665200.

The previous prime is 3643995659. The next prime is 3643995721. The reversal of 3643995672 is 2765993463.

3643995672 is a `hidden beast` number, since 36 + 43 + 9 + 9 + 567 + 2 = 666.

3643995672 is digitally balanced in base 2 and base 4, because in such bases 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 (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25305454 + ... + 25305597.

Almost surely, 2^3643995672 is an apocalyptic number.

It is an amenable number.

3643995672 is an abundant number, since it is smaller than the sum of its proper divisors (6225159468).

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

3643995672 is a wasteful number, since it uses less digits than its factorization.

3643995672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50611063 (or 50611056 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 54.

The square root of 3643995672 is about 60365.5172428763. The cubic root of 3643995672 is about 1538.8369911465.

The spelling of 3643995672 in words is "three billion, six hundred forty-three million, nine hundred ninety-five thousand, six hundred seventy-two".