243646816 has 36 divisors (see below), whose sum is σ = 557998308. Its totient is φ = 104419392.

The previous prime is 243646807. The next prime is 243646817. The reversal of 243646816 is 618646342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243646817) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 76126 + ... + 79261.

It is an arithmetic number, because the mean of its divisors is an integer number (15499953).

Almost surely, 2^243646816 is an apocalyptic number.

It is an amenable number.

243646816 is an abundant number, since it is smaller than the sum of its proper divisors (314351492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243646816 is a wasteful number, since it uses less digits than its factorization.

243646816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155411 (or 155396 counting only the distinct ones).

The product of its digits is 165888, while the sum is 40.

The square root of 243646816 is about 15609.1901135197. The cubic root of 243646816 is about 624.5783318976.

The spelling of 243646816 in words is "two hundred forty-three million, six hundred forty-six thousand, eight hundred sixteen".