138612508090 has 32 divisors (see below), whose sum is σ = 288755182080. Its totient is φ = 46922713344.

The previous prime is 138612508049. The next prime is 138612508093. The reversal of 138612508090 is 90805216831.

It is not an unprimeable number, because it can be changed into a prime (138612508093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12527247 + ... + 12538306.

It is an arithmetic number, because the mean of its divisors is an integer number (9023599440).

Almost surely, 2^138612508090 is an apocalyptic number.

138612508090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138612508090 is an abundant number, since it is smaller than the sum of its proper divisors (150142673990).

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

138612508090 is a wasteful number, since it uses less digits than its factorization.

138612508090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25065646.

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 138612508090 in words is "one hundred thirty-eight billion, six hundred twelve million, five hundred eight thousand, ninety".