138536078 has 8 divisors (see below), whose sum is σ = 208432920. Its totient is φ = 69058440.

The previous prime is 138536053. The next prime is 138536147. The reversal of 138536078 is 870635831.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103973 + ... + 105296.

It is an arithmetic number, because the mean of its divisors is an integer number (26054115).

Almost surely, 2^138536078 is an apocalyptic number.

138536078 is a deficient number, since it is larger than the sum of its proper divisors (69896842).

138536078 is a wasteful number, since it uses less digits than its factorization.

138536078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209602.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 138536078 is about 11770.1350034738. The cubic root of 138536078 is about 517.4332063124.

The spelling of 138536078 in words is "one hundred thirty-eight million, five hundred thirty-six thousand, seventy-eight".