163121328 has 30 divisors (see below), whose sum is σ = 456513564. Its totient is φ = 54373728.

The previous prime is 163121303. The next prime is 163121351. The reversal of 163121328 is 823121361.

It is a happy number.

163121328 is a `hidden beast` number, since 1 + 631 + 2 + 1 + 3 + 28 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 566250 + ... + 566537.

Almost surely, 2^163121328 is an apocalyptic number.

163121328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

163121328 is an abundant number, since it is smaller than the sum of its proper divisors (293392236).

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

163121328 is a wasteful number, since it uses less digits than its factorization.

163121328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132801 (or 1132792 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 163121328 is about 12771.8960221261. The cubic root of 163121328 is about 546.3910574491.

Adding to 163121328 its reverse (823121361), we get a palindrome (986242689).

The spelling of 163121328 in words is "one hundred sixty-three million, one hundred twenty-one thousand, three hundred twenty-eight".