163691328 has 28 divisors (see below), whose sum is σ = 433100480. Its totient is φ = 54563712.

The previous prime is 163691323. The next prime is 163691329. The reversal of 163691328 is 823196361.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163691321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426088 + ... + 426471.

Almost surely, 2^163691328 is an apocalyptic number.

It is an amenable number.

163691328 is an abundant number, since it is smaller than the sum of its proper divisors (269409152).

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

163691328 is an equidigital number, since it uses as much as digits as its factorization.

163691328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852574 (or 852564 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 163691328 is about 12794.1911819388. The cubic root of 163691328 is about 547.0267414266.

The spelling of 163691328 in words is "one hundred sixty-three million, six hundred ninety-one thousand, three hundred twenty-eight".