163640334 has 96 divisors (see below), whose sum is σ = 409826304. Its totient is φ = 43031040.

The previous prime is 163640333. The next prime is 163640341. The reversal of 163640334 is 433046361.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163640333) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 189187 + ... + 190049.

It is an arithmetic number, because the mean of its divisors is an integer number (4269024).

Almost surely, 2^163640334 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163640334, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204913152).

163640334 is an abundant number, since it is smaller than the sum of its proper divisors (246185970).

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

163640334 is a wasteful number, since it uses less digits than its factorization.

163640334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 163640334 is about 12792.1981691967. The cubic root of 163640334 is about 546.9699312926.

Adding to 163640334 its reverse (433046361), we get a palindrome (596686695).

The spelling of 163640334 in words is "one hundred sixty-three million, six hundred forty thousand, three hundred thirty-four".