5438634820638 has 16 divisors (see below), whose sum is σ = 11350194408576. Its totient is φ = 1734057479000.

The previous prime is 5438634820637. The next prime is 5438634820657. The reversal of 5438634820638 is 8360284368345.

It is a super-2 number, since 2×5438634820638² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5438634820637) 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, 19705198488 + ... + 19705198763.

It is an arithmetic number, because the mean of its divisors is an integer number (709387150536).

Almost surely, 2^{5438634820638} is an apocalyptic number.

5438634820638 is an abundant number, since it is smaller than the sum of its proper divisors (5911559587938).

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

5438634820638 is a wasteful number, since it uses less digits than its factorization.

5438634820638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39410397279.

The product of its (nonzero) digits is 79626240, while the sum is 60.

The spelling of 5438634820638 in words is "five trillion, four hundred thirty-eight billion, six hundred thirty-four million, eight hundred twenty thousand, six hundred thirty-eight".