3638889664 has 28 divisors (see below), whose sum is σ = 7343317800. Its totient is φ = 1788604928.

The previous prime is 3638889649. The next prime is 3638889679. The reversal of 3638889664 is 4669888363.

It is an interprime number because it is at equal distance from previous prime (3638889649) and next prime (3638889679).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478069 + ... + 485620.

It is an arithmetic number, because the mean of its divisors is an integer number (262261350).

Almost surely, 2^3638889664 is an apocalyptic number.

It is an amenable number.

3638889664 is an abundant number, since it is smaller than the sum of its proper divisors (3704428136).

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

3638889664 is an equidigital number, since it uses as much as digits as its factorization.

3638889664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963760 (or 963750 counting only the distinct ones).

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

The square root of 3638889664 is about 60323.2099941639. The cubic root of 3638889664 is about 1538.1179099077.

The spelling of 3638889664 in words is "three billion, six hundred thirty-eight million, eight hundred eighty-nine thousand, six hundred sixty-four".