163728220 has 12 divisors (see below), whose sum is σ = 343829304. Its totient is φ = 65491280.

The previous prime is 163728199. The next prime is 163728221. The reversal of 163728220 is 22827361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163728221) by changing a digit.

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, 4093186 + ... + 4093225.

It is an arithmetic number, because the mean of its divisors is an integer number (28652442).

Almost surely, 2^163728220 is an apocalyptic number.

163728220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163728220 is an abundant number, since it is smaller than the sum of its proper divisors (180101084).

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

163728220 is a wasteful number, since it uses less digits than its factorization.

163728220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8186420 (or 8186418 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 163728220 is about 12795.6328487496. The cubic root of 163728220 is about 547.0678337982.

The spelling of 163728220 in words is "one hundred sixty-three million, seven hundred twenty-eight thousand, two hundred twenty".