213645168 has 80 divisors (see below), whose sum is σ = 669004800. Its totient is φ = 64739520.

The previous prime is 213645163. The next prime is 213645191. The reversal of 213645168 is 861546312.

It is a happy number.

213645168 is a `hidden beast` number, since 2 + 1 + 3 + 645 + 1 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213645161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17728 + ... + 27231.

It is an arithmetic number, because the mean of its divisors is an integer number (8362560).

Almost surely, 2^213645168 is an apocalyptic number.

It is an amenable number.

213645168 is an abundant number, since it is smaller than the sum of its proper divisors (455359632).

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

213645168 is a wasteful number, since it uses less digits than its factorization.

213645168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44987 (or 44975 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 213645168 is about 14616.6058987714. The cubic root of 213645168 is about 597.8116280843.

The spelling of 213645168 in words is "two hundred thirteen million, six hundred forty-five thousand, one hundred sixty-eight".