138028656 has 40 divisors (see below), whose sum is σ = 357477120. Its totient is φ = 45893056.

The previous prime is 138028651. The next prime is 138028663. The reversal of 138028656 is 656820831.

It is a happy number.

It is a super-3 number, since 3×138028656³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138028651) 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 7 ways as a sum of consecutive naturals, for example, 16681 + ... + 23543.

It is an arithmetic number, because the mean of its divisors is an integer number (8936928).

Almost surely, 2^138028656 is an apocalyptic number.

138028656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138028656 is an abundant number, since it is smaller than the sum of its proper divisors (219448464).

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

138028656 is a wasteful number, since it uses less digits than its factorization.

138028656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7293 (or 7287 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 138028656 is about 11748.5597415173. The cubic root of 138028656 is about 516.8006918808.

The spelling of 138028656 in words is "one hundred thirty-eight million, twenty-eight thousand, six hundred fifty-six".