138729628 has 12 divisors (see below), whose sum is σ = 243723312. Its totient is φ = 69094400.

The previous prime is 138729601. The next prime is 138729631. The reversal of 138729628 is 826927831.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 66448 + ... + 68503.

It is an arithmetic number, because the mean of its divisors is an integer number (20310276).

Almost surely, 2^138729628 is an apocalyptic number.

It is an amenable number.

138729628 is a deficient number, since it is larger than the sum of its proper divisors (104993684).

138729628 is a wasteful number, since it uses less digits than its factorization.

138729628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135212 (or 135210 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 138729628 is about 11778.3542144053. The cubic root of 138729628 is about 517.6740643736.

The spelling of 138729628 in words is "one hundred thirty-eight million, seven hundred twenty-nine thousand, six hundred twenty-eight".