138068656 has 20 divisors (see below), whose sum is σ = 291827304. Its totient is φ = 62758400.

The previous prime is 138068653. The next prime is 138068669. The reversal of 138068656 is 656860831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138068653) by changing a digit.

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, 392065 + ... + 392416.

Almost surely, 2^138068656 is an apocalyptic number.

138068656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138068656 is an abundant number, since it is smaller than the sum of its proper divisors (153758648).

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

138068656 is a wasteful number, since it uses less digits than its factorization.

138068656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784500 (or 784494 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 138068656 is about 11750.2619545268. The cubic root of 138068656 is about 516.8506091268.

The spelling of 138068656 in words is "one hundred thirty-eight million, sixty-eight thousand, six hundred fifty-six".