209728324 has 27 divisors (see below), whose sum is σ = 398143767. Its totient is φ = 96623904.

The previous prime is 209728297. The next prime is 209728357. The reversal of 209728324 is 423827902.

The square root of 209728324 is 14482.

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

It can be written as a sum of positive squares in 4 ways, for example, as 123609924 + 86118400 = 11118^2 + 9280^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 376254 + ... + 376810.

Almost surely, 2^209728324 is an apocalyptic number.

209728324 is the 14482-nd square number.

It is an amenable number.

209728324 is a deficient number, since it is larger than the sum of its proper divisors (188415443).

209728324 is an equidigital number, since it uses as much as digits as its factorization.

209728324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The cubic root of 209728324 is about 594.1357638789.

The spelling of 209728324 in words is "two hundred nine million, seven hundred twenty-eight thousand, three hundred twenty-four".