6538638140 has 12 divisors (see below), whose sum is σ = 13731140136. Its totient is φ = 2615455248.

The previous prime is 6538638097. The next prime is 6538638157. The reversal of 6538638140 is 418368356.

It is a junction number, because it is equal to n+sod(n) for n = 6538638091 and 6538638100.

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 3 ways as a sum of consecutive naturals, for example, 163465934 + ... + 163465973.

It is an arithmetic number, because the mean of its divisors is an integer number (1144261678).

Almost surely, 2^6538638140 is an apocalyptic number.

It is an amenable number.

6538638140 is an abundant number, since it is smaller than the sum of its proper divisors (7192501996).

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

6538638140 is a wasteful number, since it uses less digits than its factorization.

6538638140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326931916 (or 326931914 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 6538638140 is about 80861.8460091037. The cubic root of 6538638140 is about 1869.9461545688.

The spelling of 6538638140 in words is "six billion, five hundred thirty-eight million, six hundred thirty-eight thousand, one hundred forty".