138428779106 has 8 divisors (see below), whose sum is σ = 207951704364. Its totient is φ = 69111544320.

The previous prime is 138428779081. The next prime is 138428779129. The reversal of 138428779106 is 601977824831.

138428779106 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 134095848481 + 4332930625 = 366191^2 + 65825^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51420935 + ... + 51423626.

Almost surely, 2^138428779106 is an apocalyptic number.

138428779106 is a deficient number, since it is larger than the sum of its proper divisors (69522925258).

138428779106 is a wasteful number, since it uses less digits than its factorization.

138428779106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102845236.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 138428779106 in words is "one hundred thirty-eight billion, four hundred twenty-eight million, seven hundred seventy-nine thousand, one hundred six".