3644781680 has 40 divisors (see below), whose sum is σ = 8524891872. Its totient is φ = 1449177344.

The previous prime is 3644781653. The next prime is 3644781703. The reversal of 3644781680 is 861874463.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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, 123047 + ... + 149766.

Almost surely, 2^3644781680 is an apocalyptic number.

It is an amenable number.

3644781680 is an abundant number, since it is smaller than the sum of its proper divisors (4880110192).

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

3644781680 is a wasteful number, since it uses less digits than its factorization.

3644781680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272993 (or 272987 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The square root of 3644781680 is about 60372.0272974165. The cubic root of 3644781680 is about 1538.9476253092.

The spelling of 3644781680 in words is "three billion, six hundred forty-four million, seven hundred eighty-one thousand, six hundred eighty".