181640328 has 32 divisors (see below), whose sum is σ = 462672000. Its totient is φ = 59403968.

The previous prime is 181640317. The next prime is 181640339. The reversal of 181640328 is 823046181.

181640328 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (181640317) and next prime (181640339).

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, 70128 + ... + 72671.

It is an arithmetic number, because the mean of its divisors is an integer number (14458500).

Almost surely, 2^181640328 is an apocalyptic number.

It is an amenable number.

181640328 is an abundant number, since it is smaller than the sum of its proper divisors (281031672).

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

181640328 is a wasteful number, since it uses less digits than its factorization.

181640328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142861 (or 142857 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 181640328 is about 13477.4006395892. The cubic root of 181640328 is about 566.3315533411.

The spelling of 181640328 in words is "one hundred eighty-one million, six hundred forty thousand, three hundred twenty-eight".