164639728 has 40 divisors (see below), whose sum is σ = 359999280. Its totient is φ = 72253440.

The previous prime is 164639719. The next prime is 164639753. The reversal of 164639728 is 827936461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11025 + ... + 21232.

It is an arithmetic number, because the mean of its divisors is an integer number (8999982).

Almost surely, 2^164639728 is an apocalyptic number.

It is an amenable number.

164639728 is an abundant number, since it is smaller than the sum of its proper divisors (195359552).

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

164639728 is a wasteful number, since it uses less digits than its factorization.

164639728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32305 (or 32299 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The square root of 164639728 is about 12831.2013467173. The cubic root of 164639728 is about 548.0811679369.

The spelling of 164639728 in words is "one hundred sixty-four million, six hundred thirty-nine thousand, seven hundred twenty-eight".