320446640 has 80 divisors (see below), whose sum is σ = 776179488. Its totient is φ = 122923008.

The previous prime is 320446601. The next prime is 320446657. The reversal of 320446640 is 46644023.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

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, 215339 + ... + 216821.

Almost surely, 2^320446640 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 320446640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388089744).

320446640 is an abundant number, since it is smaller than the sum of its proper divisors (455732848).

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

320446640 is a wasteful number, since it uses less digits than its factorization.

320446640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606 (or 1600 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 320446640 is about 17901.0234344297. The cubic root of 320446640 is about 684.3084572542.

The spelling of 320446640 in words is "three hundred twenty million, four hundred forty-six thousand, six hundred forty".