163320728 has 8 divisors (see below), whose sum is σ = 306226380. Its totient is φ = 81660360.

The previous prime is 163320727. The next prime is 163320757. The reversal of 163320728 is 827023361.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 163320694 and 163320703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163320727) 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 as a sum of consecutive naturals, namely, 10207538 + ... + 10207553.

Almost surely, 2^163320728 is an apocalyptic number.

It is an amenable number.

163320728 is a deficient number, since it is larger than the sum of its proper divisors (142905652).

163320728 is a wasteful number, since it uses less digits than its factorization.

163320728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20415097 (or 20415093 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 163320728 is about 12779.6998399806. The cubic root of 163320728 is about 546.6136034819.

The spelling of 163320728 in words is "one hundred sixty-three million, three hundred twenty thousand, seven hundred twenty-eight".