209615968 has 12 divisors (see below), whose sum is σ = 412681500. Its totient is φ = 104807968.

The previous prime is 209615957. The next prime is 209615971. The reversal of 209615968 is 869516902.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3275218 + ... + 3275281.

It is an arithmetic number, because the mean of its divisors is an integer number (34390125).

Almost surely, 2^209615968 is an apocalyptic number.

It is an amenable number.

209615968 is a deficient number, since it is larger than the sum of its proper divisors (203065532).

209615968 is an equidigital number, since it uses as much as digits as its factorization.

209615968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6550509 (or 6550501 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 209615968 is about 14478.1203199863. The cubic root of 209615968 is about 594.0296478001.

The spelling of 209615968 in words is "two hundred nine million, six hundred fifteen thousand, nine hundred sixty-eight".