138623485720 has 32 divisors (see below), whose sum is σ = 312220228320. Its totient is φ = 55392970240.

The previous prime is 138623485717. The next prime is 138623485729. The reversal of 138623485720 is 27584326831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138623485729) 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, 1723441 + ... + 1802080.

It is an arithmetic number, because the mean of its divisors is an integer number (9756882135).

Almost surely, 2^138623485720 is an apocalyptic number.

138623485720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138623485720 is an abundant number, since it is smaller than the sum of its proper divisors (173596742600).

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

138623485720 is a wasteful number, since it uses less digits than its factorization.

138623485720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526515 (or 3526511 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 138623485720 in words is "one hundred thirty-eight billion, six hundred twenty-three million, four hundred eighty-five thousand, seven hundred twenty".