138828068 has 24 divisors (see below), whose sum is σ = 246939000. Its totient is φ = 68283648.

The previous prime is 138828061. The next prime is 138828073. The reversal of 138828068 is 860828831.

It can be written as a sum of positive squares in 4 ways, for example, as 12544 + 138815524 = 112^2 + 11782^2 .

It is a super-2 number, since 2×138828068² = 38546464929225248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138828061) 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, 63896 + ... + 66032.

It is an arithmetic number, because the mean of its divisors is an integer number (10289125).

Almost surely, 2^138828068 is an apocalyptic number.

It is an amenable number.

138828068 is a deficient number, since it is larger than the sum of its proper divisors (108110932).

138828068 is a wasteful number, since it uses less digits than its factorization.

138828068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399 (or 2397 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 44.

The square root of 138828068 is about 11782.5323254384. The cubic root of 138828068 is about 517.7964794313.

The spelling of 138828068 in words is "one hundred thirty-eight million, eight hundred twenty-eight thousand, sixty-eight".