320066560 has 88 divisors (see below), whose sum is σ = 837730656. Its totient is φ = 116367360.

The previous prime is 320066519. The next prime is 320066581. The reversal of 320066560 is 65660023.

It is a tau number, because it is divible by the number of its divisors (88).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53479 + ... + 59161.

Almost surely, 2^320066560 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 320066560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418865328).

320066560 is an abundant number, since it is smaller than the sum of its proper divisors (517664096).

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

320066560 is a wasteful number, since it uses less digits than its factorization.

320066560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5719 (or 5701 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 320066560 is about 17890.4041318244. The cubic root of 320066560 is about 684.0377987160.

The spelling of 320066560 in words is "three hundred twenty million, sixty-six thousand, five hundred sixty".