213689668 has 6 divisors (see below), whose sum is σ = 373956926. Its totient is φ = 106844832.

The previous prime is 213689633. The next prime is 213689701. The reversal of 213689668 is 866986312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 150994944 + 62694724 = 12288^2 + 7918^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26711205 + ... + 26711212.

Almost surely, 2^213689668 is an apocalyptic number.

It is an amenable number.

213689668 is a deficient number, since it is larger than the sum of its proper divisors (160267258).

213689668 is a wasteful number, since it uses less digits than its factorization.

213689668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53422421 (or 53422419 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

The square root of 213689668 is about 14618.1280607334. The cubic root of 213689668 is about 597.8531311225.

The spelling of 213689668 in words is "two hundred thirteen million, six hundred eighty-nine thousand, six hundred sixty-eight".