3638889646 has 24 divisors (see below), whose sum is σ = 6504363936. Its totient is φ = 1521485280.

The previous prime is 3638889643. The next prime is 3638889649. The reversal of 3638889646 is 6469888363.

3638889646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3638889643) and next prime (3638889649).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638889641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 448806 + ... + 456841.

It is an arithmetic number, because the mean of its divisors is an integer number (271015164).

Almost surely, 2^3638889646 is an apocalyptic number.

3638889646 is a deficient number, since it is larger than the sum of its proper divisors (2865474290).

3638889646 is a wasteful number, since it uses less digits than its factorization.

3638889646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905704 (or 905697 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 61.

The square root of 3638889646 is about 60323.2098449676. The cubic root of 3638889646 is about 1538.1179073716.

The spelling of 3638889646 in words is "three billion, six hundred thirty-eight million, eight hundred eighty-nine thousand, six hundred forty-six".