3644641388 has 24 divisors (see below), whose sum is σ = 6414088464. Its totient is φ = 1812070400.

The previous prime is 3644641361. The next prime is 3644641391. The reversal of 3644641388 is 8831464463.

3644641388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 656183 + ... + 661713.

It is an arithmetic number, because the mean of its divisors is an integer number (267253686).

Almost surely, 2^3644641388 is an apocalyptic number.

It is an amenable number.

3644641388 is a deficient number, since it is larger than the sum of its proper divisors (2769447076).

3644641388 is a wasteful number, since it uses less digits than its factorization.

3644641388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6433 (or 6431 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 47.

The square root of 3644641388 is about 60370.8653905176. The cubic root of 3644641388 is about 1538.9278797452.

The spelling of 3644641388 in words is "three billion, six hundred forty-four million, six hundred forty-one thousand, three hundred eighty-eight".