138726864808 has 64 divisors (see below), whose sum is σ = 300939528960. Its totient is φ = 58723301376.

The previous prime is 138726864781. The next prime is 138726864833. The reversal of 138726864808 is 808468627831.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2706910 + ... + 2757682.

It is an arithmetic number, because the mean of its divisors is an integer number (4702180140).

Almost surely, 2^138726864808 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 138726864808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150469764480).

138726864808 is an abundant number, since it is smaller than the sum of its proper divisors (162212664152).

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

138726864808 is a wasteful number, since it uses less digits than its factorization.

138726864808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51386 (or 51382 counting only the distinct ones).

The product of its (nonzero) digits is 24772608, while the sum is 61.

The spelling of 138726864808 in words is "one hundred thirty-eight billion, seven hundred twenty-six million, eight hundred sixty-four thousand, eight hundred eight".