209716370704 has 15 divisors (see below), whose sum is σ = 406329017367. Its totient is φ = 104857269456.

The previous prime is 209716370693. The next prime is 209716370711. The reversal of 209716370704 is 407073617902.

The square root of 209716370704 is 457948.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×209716370704² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1774549 + ... + 1889035.

Almost surely, 2^209716370704 is an apocalyptic number.

209716370704 is the 457948-th square number.

It is an amenable number.

209716370704 is a deficient number, since it is larger than the sum of its proper divisors (196612646663).

209716370704 is an frugal number, since it uses more digits than its factorization.

209716370704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228982 (or 114489 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 46.

The spelling of 209716370704 in words is "two hundred nine billion, seven hundred sixteen million, three hundred seventy thousand, seven hundred four".