320238644 has 12 divisors (see below), whose sum is σ = 611364768. Its totient is φ = 145563000.

The previous prime is 320238641. The next prime is 320238671. The reversal of 320238644 is 446832023.

It is a super-2 number, since 2×320238644² = 205105578221917472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320238644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320238641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3639032 + ... + 3639119.

It is an arithmetic number, because the mean of its divisors is an integer number (50947064).

Almost surely, 2^320238644 is an apocalyptic number.

It is an amenable number.

320238644 is a deficient number, since it is larger than the sum of its proper divisors (291126124).

320238644 is a wasteful number, since it uses less digits than its factorization.

320238644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7278166 (or 7278164 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 320238644 is about 17895.2128794267. The cubic root of 320238644 is about 684.1603678787.

The spelling of 320238644 in words is "three hundred twenty million, two hundred thirty-eight thousand, six hundred forty-four".