213287668 has 18 divisors (see below), whose sum is σ = 410271218. Its totient is φ = 96948720.

The previous prime is 213287653. The next prime is 213287687. The reversal of 213287668 is 866782312.

213287668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 177742224 + 35545444 = 13332^2 + 5962^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219855 + ... + 220822.

Almost surely, 2^213287668 is an apocalyptic number.

It is an amenable number.

213287668 is a deficient number, since it is larger than the sum of its proper divisors (196983550).

213287668 is a wasteful number, since it uses less digits than its factorization.

213287668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440703 (or 440690 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 213287668 is about 14604.3715373172. The cubic root of 213287668 is about 597.4779954899.

The spelling of 213287668 in words is "two hundred thirteen million, two hundred eighty-seven thousand, six hundred sixty-eight".