138470028 has 24 divisors (see below), whose sum is σ = 337145088. Its totient is φ = 44149776.

The previous prime is 138470023. The next prime is 138470029. The reversal of 138470028 is 820074831.

It is not an unprimeable number, because it can be changed into a prime (138470023) 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, 250576 + ... + 251127.

It is an arithmetic number, because the mean of its divisors is an integer number (14047712).

Almost surely, 2^138470028 is an apocalyptic number.

It is an amenable number.

138470028 is an abundant number, since it is smaller than the sum of its proper divisors (198675060).

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

138470028 is a wasteful number, since it uses less digits than its factorization.

138470028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501733 (or 501731 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 138470028 is about 11767.3288387807. The cubic root of 138470028 is about 517.3509608385.

The spelling of 138470028 in words is "one hundred thirty-eight million, four hundred seventy thousand, twenty-eight".