163981604 has 24 divisors (see below), whose sum is σ = 291445728. Its totient is φ = 80720640.

The previous prime is 163981589. The next prime is 163981607. The reversal of 163981604 is 406189361.

It is not an unprimeable number, because it can be changed into a prime (163981607) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 80867 + ... + 82869.

It is an arithmetic number, because the mean of its divisors is an integer number (12143572).

Almost surely, 2^163981604 is an apocalyptic number.

It is an amenable number.

163981604 is a deficient number, since it is larger than the sum of its proper divisors (127464124).

163981604 is a wasteful number, since it uses less digits than its factorization.

163981604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315 (or 2313 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 163981604 is about 12805.5302115922. The cubic root of 163981604 is about 547.3499004030.

The spelling of 163981604 in words is "one hundred sixty-three million, nine hundred eighty-one thousand, six hundred four".