163897668 has 72 divisors (see below), whose sum is σ = 468730080. Its totient is φ = 49662720.

The previous prime is 163897661. The next prime is 163897681. The reversal of 163897668 is 866798361.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (163897661) 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 23 ways as a sum of consecutive naturals, for example, 3028 + ... + 18356.

It is an arithmetic number, because the mean of its divisors is an integer number (6510140).

Almost surely, 2^163897668 is an apocalyptic number.

163897668 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 163897668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234365040).

163897668 is an abundant number, since it is smaller than the sum of its proper divisors (304832412).

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

163897668 is a wasteful number, since it uses less digits than its factorization.

163897668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15359 (or 15345 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 163897668 is about 12802.2524580638. The cubic root of 163897668 is about 547.2564952058.

The spelling of 163897668 in words is "one hundred sixty-three million, eight hundred ninety-seven thousand, six hundred sixty-eight".