138161568 has 48 divisors (see below), whose sum is σ = 375187680. Its totient is φ = 44464896.

The previous prime is 138161563. The next prime is 138161579. The reversal of 138161568 is 865161831.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (138161561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22030 + ... + 27597.

It is an arithmetic number, because the mean of its divisors is an integer number (7816410).

Almost surely, 2^138161568 is an apocalyptic number.

It is an amenable number.

138161568 is an abundant number, since it is smaller than the sum of its proper divisors (237026112).

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

138161568 is a wasteful number, since it uses less digits than its factorization.

138161568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49669 (or 49661 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The square root of 138161568 is about 11754.2149035995. The cubic root of 138161568 is about 516.9665197115.

The spelling of 138161568 in words is "one hundred thirty-eight million, one hundred sixty-one thousand, five hundred sixty-eight".