243670656 has 128 divisors (see below), whose sum is σ = 692539200. Its totient is φ = 75644928.

The previous prime is 243670643. The next prime is 243670657. The reversal of 243670656 is 656076342.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (243670657) 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 15 ways as a sum of consecutive naturals, for example, 1063950 + ... + 1064178.

Almost surely, 2^243670656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243670656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346269600).

243670656 is an abundant number, since it is smaller than the sum of its proper divisors (448868544).

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

243670656 is a wasteful number, since it uses less digits than its factorization.

243670656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 39.

The square root of 243670656 is about 15609.9537475292. The cubic root of 243670656 is about 624.5987021779.

The spelling of 243670656 in words is "two hundred forty-three million, six hundred seventy thousand, six hundred fifty-six".