243764073 has 30 divisors (see below), whose sum is σ = 423599946. Its totient is φ = 139291488.

The previous prime is 243764063. The next prime is 243764089. The reversal of 243764073 is 370467342.

It is a happy number.

243764073 is a `hidden beast` number, since 2 + 4 + 3 + 7 + 640 + 7 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 190357209 + 53406864 = 13797^2 + 7308^2 .

It is not a de Polignac number, because 243764073 - 2⁵ = 243764041 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243764063) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 26740 + ... + 34677.

Almost surely, 2^243764073 is an apocalyptic number.

It is an amenable number.

243764073 is a deficient number, since it is larger than the sum of its proper divisors (179835873).

243764073 is an equidigital number, since it uses as much as digits as its factorization.

243764073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61443 (or 61427 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 36.

The square root of 243764073 is about 15612.9456861926. The cubic root of 243764073 is about 624.6785102860.

The spelling of 243764073 in words is "two hundred forty-three million, seven hundred sixty-four thousand, seventy-three".