138228085 has 8 divisors (see below), whose sum is σ = 166042296. Its totient is φ = 110470080.

The previous prime is 138228067. The next prime is 138228089. The reversal of 138228085 is 580822831.

138228085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 37466641 + 100761444 = 6121^2 + 10038^2 .

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

It is not a de Polignac number, because 138228085 - 2⁵ = 138228053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138228089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8434 + ... + 18643.

It is an arithmetic number, because the mean of its divisors is an integer number (20755287).

Almost surely, 2^138228085 is an apocalyptic number.

It is an amenable number.

138228085 is a deficient number, since it is larger than the sum of its proper divisors (27814211).

138228085 is a wasteful number, since it uses less digits than its factorization.

138228085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28103.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 138228085 is about 11757.0440587760. The cubic root of 138228085 is about 517.0494698051.

The spelling of 138228085 in words is "one hundred thirty-eight million, two hundred twenty-eight thousand, eighty-five".