320243644 has 12 divisors (see below), whose sum is σ = 640487344. Its totient is φ = 137247264.

The previous prime is 320243641. The next prime is 320243659. The reversal of 320243644 is 446342023.

320243644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

320243644 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 11437273 = 320243644 / (3 + 2 + 0 + 2 + 4 + 3 + 6 + 4 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320243641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5718609 + ... + 5718664.

Almost surely, 2^320243644 is an apocalyptic number.

It is an amenable number.

320243644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

320243644 is a wasteful number, since it uses less digits than its factorization.

320243644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11437284 (or 11437282 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

The square root of 320243644 is about 17895.3525810474. The cubic root of 320243644 is about 684.1639285400.

Adding to 320243644 its reverse (446342023), we get a palindrome (766585667).

The spelling of 320243644 in words is "three hundred twenty million, two hundred forty-three thousand, six hundred forty-four".