138266678 has 64 divisors (see below), whose sum is σ = 250822656. Its totient is φ = 56448000.

The previous prime is 138266671. The next prime is 138266683. The reversal of 138266678 is 876662831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138266671) 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 31 ways as a sum of consecutive naturals, for example, 1088651 + ... + 1088777.

It is an arithmetic number, because the mean of its divisors is an integer number (3919104).

Almost surely, 2^138266678 is an apocalyptic number.

138266678 is a deficient number, since it is larger than the sum of its proper divisors (112555978).

138266678 is a wasteful number, since it uses less digits than its factorization.

138266678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its digits is 580608, while the sum is 47.

The square root of 138266678 is about 11758.6852156183. The cubic root of 138266678 is about 517.0975850473.

The spelling of 138266678 in words is "one hundred thirty-eight million, two hundred sixty-six thousand, six hundred seventy-eight".