320444644 has 48 divisors (see below), whose sum is σ = 628379136. Its totient is φ = 141984000.

The previous prime is 320444627. The next prime is 320444653. The reversal of 320444644 is 446444023.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 220119 + ... + 221569.

It is an arithmetic number, because the mean of its divisors is an integer number (13091232).

Almost surely, 2^320444644 is an apocalyptic number.

It is an amenable number.

320444644 is a deficient number, since it is larger than the sum of its proper divisors (307934492).

320444644 is a wasteful number, since it uses less digits than its factorization.

320444644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636 (or 1634 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 31.

The square root of 320444644 is about 17900.9676833405. The cubic root of 320444644 is about 684.3070364430.

Adding to 320444644 its reverse (446444023), we get a palindrome (766888667).

The spelling of 320444644 in words is "three hundred twenty million, four hundred forty-four thousand, six hundred forty-four".