243312730 has 32 divisors (see below), whose sum is σ = 444487824. Its totient is φ = 95886336.

The previous prime is 243312691. The next prime is 243312781. The reversal of 243312730 is 37213342.

It can be written as a sum of positive squares in 8 ways, for example, as 181360089 + 61952641 = 13467^2 + 7871^2 .

It is a junction number, because it is equal to n+sod(n) for n = 243312695 and 243312704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222064 + ... + 223156.

Almost surely, 2^243312730 is an apocalyptic number.

243312730 is a deficient number, since it is larger than the sum of its proper divisors (201175094).

243312730 is a wasteful number, since it uses less digits than its factorization.

243312730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410.

The product of its (nonzero) digits is 3024, while the sum is 25.

The square root of 243312730 is about 15598.4848623192. The cubic root of 243312730 is about 624.2927295315.

The spelling of 243312730 in words is "two hundred forty-three million, three hundred twelve thousand, seven hundred thirty".