138531108744 has 48 divisors (see below), whose sum is σ = 428786766720. Its totient is φ = 39580316640.

The previous prime is 138531108743. The next prime is 138531108761. The reversal of 138531108744 is 447801135831.

138531108744 is a `hidden beast` number, since 1 + 3 + 8 + 531 + 108 + 7 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 138531108744.

It is not an unprimeable number, because it can be changed into a prime (138531108743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137431152 + ... + 137432159.

It is an arithmetic number, because the mean of its divisors is an integer number (8933057640).

Almost surely, 2^138531108744 is an apocalyptic number.

138531108744 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138531108744 is an abundant number, since it is smaller than the sum of its proper divisors (290255657976).

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

138531108744 is a wasteful number, since it uses less digits than its factorization.

138531108744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274863330 (or 274863323 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 138531108744 in words is "one hundred thirty-eight billion, five hundred thirty-one million, one hundred eight thousand, seven hundred forty-four".