138228566 has 32 divisors (see below), whose sum is σ = 248014848. Its totient is φ = 56531520.

The previous prime is 138228533. The next prime is 138228569. The reversal of 138228566 is 665822831.

138228566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138228569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29501 + ... + 33863.

It is an arithmetic number, because the mean of its divisors is an integer number (7750464).

Almost surely, 2^138228566 is an apocalyptic number.

138228566 is a deficient number, since it is larger than the sum of its proper divisors (109786282).

138228566 is a wasteful number, since it uses less digits than its factorization.

138228566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4476.

The product of its digits is 138240, while the sum is 41.

The square root of 138228566 is about 11757.0645145802. The cubic root of 138228566 is about 517.0500695397.

The spelling of 138228566 in words is "one hundred thirty-eight million, two hundred twenty-eight thousand, five hundred sixty-six".