138639577780 has 48 divisors (see below), whose sum is σ = 317640185856. Its totient is φ = 50409706880.

The previous prime is 138639577763. The next prime is 138639577789. The reversal of 138639577780 is 87775936831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138639577789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3103362 + ... + 3147718.

It is an arithmetic number, because the mean of its divisors is an integer number (6617503872).

Almost surely, 2^138639577780 is an apocalyptic number.

138639577780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138639577780 is an abundant number, since it is smaller than the sum of its proper divisors (179000608076).

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

138639577780 is a wasteful number, since it uses less digits than its factorization.

138639577780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58584 (or 58582 counting only the distinct ones).

The product of its (nonzero) digits is 53343360, while the sum is 64.

The spelling of 138639577780 in words is "one hundred thirty-eight billion, six hundred thirty-nine million, five hundred seventy-seven thousand, seven hundred eighty".