163729728 has 112 divisors (see below), whose sum is σ = 493288320. Its totient is φ = 53222400.

The previous prime is 163729723. The next prime is 163729757. The reversal of 163729728 is 827927361.

163729728 is a `hidden beast` number, since 1 + 637 + 2 + 9 + 7 + 2 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163729723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69693 + ... + 72003.

It is an arithmetic number, because the mean of its divisors is an integer number (4404360).

Almost surely, 2^163729728 is an apocalyptic number.

163729728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163729728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246644160).

163729728 is an abundant number, since it is smaller than the sum of its proper divisors (329558592).

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

163729728 is a wasteful number, since it uses less digits than its factorization.

163729728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373 (or 2357 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 163729728 is about 12795.6917749686. The cubic root of 163729728 is about 547.0695133615.

The spelling of 163729728 in words is "one hundred sixty-three million, seven hundred twenty-nine thousand, seven hundred twenty-eight".