320661644 has 12 divisors (see below), whose sum is σ = 579259968. Its totient is φ = 155158800.

The previous prime is 320661643. The next prime is 320661661. The reversal of 320661644 is 446166023.

It is a self number, because there is not a number n which added to its sum of digits gives 320661644.

It is not an unprimeable number, because it can be changed into a prime (320661641) 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, 1292867 + ... + 1293114.

It is an arithmetic number, because the mean of its divisors is an integer number (48271664).

Almost surely, 2^320661644 is an apocalyptic number.

It is an amenable number.

320661644 is a deficient number, since it is larger than the sum of its proper divisors (258598324).

320661644 is a wasteful number, since it uses less digits than its factorization.

320661644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586016 (or 2586014 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 320661644 is about 17907.0277824099. The cubic root of 320661644 is about 684.4614688573.

The spelling of 320661644 in words is "three hundred twenty million, six hundred sixty-one thousand, six hundred forty-four".