243609664 has 21 divisors (see below), whose sum is σ = 483660831. Its totient is φ = 121742400.

The previous prime is 243609647. The next prime is 243609671. The reversal of 243609664 is 466906342.

The square root of 243609664 is 15608.

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

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, 123889 + ... + 125839.

Almost surely, 2^243609664 is an apocalyptic number.

243609664 is the 15608-th square number.

It is an amenable number.

243609664 is a deficient number, since it is larger than the sum of its proper divisors (240051167).

243609664 is an frugal number, since it uses more digits than its factorization.

243609664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3914 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 40.

The cubic root of 243609664 is about 624.5465844224.

Multiplying 243609664 by its product of nonzero digits (186624), we get a square (45463409934336 = 6742656²).

The spelling of 243609664 in words is "two hundred forty-three million, six hundred nine thousand, six hundred sixty-four".