161728022 has 8 divisors (see below), whose sum is σ = 242649000. Its totient is φ = 80845024.

The previous prime is 161728013. The next prime is 161728033. The reversal of 161728022 is 220827161.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 6629 + ... + 19167.

It is an arithmetic number, because the mean of its divisors is an integer number (30331125).

Almost surely, 2^161728022 is an apocalyptic number.

161728022 is a deficient number, since it is larger than the sum of its proper divisors (80920978).

161728022 is a wasteful number, since it uses less digits than its factorization.

161728022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18990.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 161728022 is about 12717.2332682860. The cubic root of 161728022 is about 544.8309348501.

The spelling of 161728022 in words is "one hundred sixty-one million, seven hundred twenty-eight thousand, twenty-two".