138800028 has 24 divisors (see below), whose sum is σ = 324213120. Its totient is φ = 46217200.

The previous prime is 138800027. The next prime is 138800041. The reversal of 138800028 is 820008831.

138800028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 138799968 and 138800004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138800021) 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, 6553 + ... + 17903.

It is an arithmetic number, because the mean of its divisors is an integer number (13508880).

Almost surely, 2^138800028 is an apocalyptic number.

It is an amenable number.

138800028 is an abundant number, since it is smaller than the sum of its proper divisors (185413092).

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

138800028 is a wasteful number, since it uses less digits than its factorization.

138800028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12377 (or 12375 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 138800028 is about 11781.3423683382. The cubic root of 138800028 is about 517.7616161862.

Adding to 138800028 its reverse (820008831), we get a palindrome (958808859).

The spelling of 138800028 in words is "one hundred thirty-eight million, eight hundred thousand, twenty-eight".