4644918638 has 16 divisors (see below), whose sum is σ = 7353456000. Its totient is φ = 2194412472.

The previous prime is 4644918613. The next prime is 4644918643. The reversal of 4644918638 is 8368194464.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 4644918638.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146858 + ... + 175661.

It is an arithmetic number, because the mean of its divisors is an integer number (459591000).

Almost surely, 2^4644918638 is an apocalyptic number.

4644918638 is a deficient number, since it is larger than the sum of its proper divisors (2708537362).

4644918638 is a wasteful number, since it uses less digits than its factorization.

4644918638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322919.

The product of its digits is 3981312, while the sum is 53.

The square root of 4644918638 is about 68153.6399468143. The cubic root of 4644918638 is about 1668.4993317357.

The spelling of 4644918638 in words is "four billion, six hundred forty-four million, nine hundred eighteen thousand, six hundred thirty-eight".