209917068 has 12 divisors (see below), whose sum is σ = 489806520. Its totient is φ = 69972352.

The previous prime is 209917039. The next prime is 209917129. The reversal of 209917068 is 860719902.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8746533 + ... + 8746556.

It is an arithmetic number, because the mean of its divisors is an integer number (40817210).

Almost surely, 2^209917068 is an apocalyptic number.

It is an amenable number.

209917068 is an abundant number, since it is smaller than the sum of its proper divisors (279889452).

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

209917068 is a wasteful number, since it uses less digits than its factorization.

209917068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17493096 (or 17493094 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 209917068 is about 14488.5150377808. The cubic root of 209917068 is about 594.3139403177.

The spelling of 209917068 in words is "two hundred nine million, nine hundred seventeen thousand, sixty-eight".