5243643638 has 16 divisors (see below), whose sum is σ = 8280082656. Its totient is φ = 2485633920.

The previous prime is 5243643637. The next prime is 5243643641. The reversal of 5243643638 is 8363463425.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5243643637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499193 + ... + 509588.

It is an arithmetic number, because the mean of its divisors is an integer number (517505166).

Almost surely, 2^5243643638 is an apocalyptic number.

5243643638 is a deficient number, since it is larger than the sum of its proper divisors (3036439018).

5243643638 is a wasteful number, since it uses less digits than its factorization.

5243643638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008919.

The product of its digits is 1244160, while the sum is 44.

The square root of 5243643638 is about 72413.0073812709. The cubic root of 5243643638 is about 1737.3116142940.

The spelling of 5243643638 in words is "five billion, two hundred forty-three million, six hundred forty-three thousand, six hundred thirty-eight".