138678616 has 8 divisors (see below), whose sum is σ = 260022420. Its totient is φ = 69339304.

The previous prime is 138678599. The next prime is 138678619. The reversal of 138678616 is 616876831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138678619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8667406 + ... + 8667421.

Almost surely, 2^138678616 is an apocalyptic number.

It is an amenable number.

138678616 is a deficient number, since it is larger than the sum of its proper divisors (121343804).

138678616 is a wasteful number, since it uses less digits than its factorization.

138678616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17334833 (or 17334829 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 138678616 is about 11776.1885175128. The cubic root of 138678616 is about 517.6106056225.

The spelling of 138678616 in words is "one hundred thirty-eight million, six hundred seventy-eight thousand, six hundred sixteen".