213766668 has 24 divisors (see below), whose sum is σ = 554210160. Its totient is φ = 71255520.

The previous prime is 213766667. The next prime is 213766699. The reversal of 213766668 is 866667312.

213766668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (213766667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 989553 + ... + 989768.

It is an arithmetic number, because the mean of its divisors is an integer number (23092090).

Almost surely, 2^213766668 is an apocalyptic number.

It is an amenable number.

213766668 is an abundant number, since it is smaller than the sum of its proper divisors (340443492).

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

213766668 is a wasteful number, since it uses less digits than its factorization.

213766668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979334 (or 1979326 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 213766668 is about 14620.7615396736. The cubic root of 213766668 is about 597.9249317595.

The spelling of 213766668 in words is "two hundred thirteen million, seven hundred sixty-six thousand, six hundred sixty-eight".