138864728668 has 12 divisors (see below), whose sum is σ = 243015895080. Its totient is φ = 69431615792.

The previous prime is 138864728663. The next prime is 138864728669. The reversal of 138864728668 is 866827468831.

138864728668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×138864728668³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138864728663) by changing a digit.

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, 576555 + ... + 781117.

It is an arithmetic number, because the mean of its divisors is an integer number (20251324590).

Almost surely, 2^138864728668 is an apocalyptic number.

It is an amenable number.

138864728668 is a deficient number, since it is larger than the sum of its proper divisors (104151166412).

138864728668 is a wasteful number, since it uses less digits than its factorization.

138864728668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374276 (or 374274 counting only the distinct ones).

The product of its digits is 148635648, while the sum is 67.

The spelling of 138864728668 in words is "one hundred thirty-eight billion, eight hundred sixty-four million, seven hundred twenty-eight thousand, six hundred sixty-eight".