213730668 has 18 divisors (see below), whose sum is σ = 540263724. Its totient is φ = 71243544.

The previous prime is 213730591. The next prime is 213730669. The reversal of 213730668 is 866037312.

It is a happy number.

213730668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5936963 = 213730668 / (2 + 1 + 3 + 7 + 3 + 0 + 6 + 6 + 8).

It is not an unprimeable number, because it can be changed into a prime (213730669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2968446 + ... + 2968517.

Almost surely, 2^213730668 is an apocalyptic number.

It is an amenable number.

213730668 is an abundant number, since it is smaller than the sum of its proper divisors (326533056).

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

213730668 is a wasteful number, since it uses less digits than its factorization.

213730668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5936973 (or 5936968 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 213730668 is about 14619.5303618140. The cubic root of 213730668 is about 597.8913647770.

The spelling of 213730668 in words is "two hundred thirteen million, seven hundred thirty thousand, six hundred sixty-eight".