2638645216 has 48 divisors (see below), whose sum is σ = 5524742160. Its totient is φ = 1236971520.

The previous prime is 2638645193. The next prime is 2638645231. The reversal of 2638645216 is 6125468362.

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, 36606 + ... + 81346.

It is an arithmetic number, because the mean of its divisors is an integer number (115098795).

Almost surely, 2^2638645216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2638645216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2762371080).

2638645216 is an abundant number, since it is smaller than the sum of its proper divisors (2886096944).

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

2638645216 is a wasteful number, since it uses less digits than its factorization.

2638645216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44867 (or 44859 counting only the distinct ones).

The product of its digits is 414720, while the sum is 43.

The square root of 2638645216 is about 51367.7448989149. The cubic root of 2638645216 is about 1381.8481881044.

The spelling of 2638645216 in words is "two billion, six hundred thirty-eight million, six hundred forty-five thousand, two hundred sixteen".