138535020728 has 16 divisors (see below), whose sum is σ = 279734176680. Its totient is φ = 63939240288.

The previous prime is 138535020727. The next prime is 138535020761. The reversal of 138535020728 is 827020535831.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138535020721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666033650 + ... + 666033857.

Almost surely, 2^138535020728 is an apocalyptic number.

It is an amenable number.

138535020728 is an abundant number, since it is smaller than the sum of its proper divisors (141199155952).

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

138535020728 is a wasteful number, since it uses less digits than its factorization.

138535020728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332067526 (or 1332067522 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 138535020728 in words is "one hundred thirty-eight billion, five hundred thirty-five million, twenty thousand, seven hundred twenty-eight".