320656560 has 320 divisors, whose sum is σ = 1206779904. Its totient is φ = 68889600.

The previous prime is 320656543. The next prime is 320656579. The reversal of 320656560 is 65656023.

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 63 ways as a sum of consecutive naturals, for example, 2447695 + ... + 2447825.

Almost surely, 2^320656560 is an apocalyptic number.

320656560 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320656560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (603389952).

320656560 is an abundant number, since it is smaller than the sum of its proper divisors (886123344).

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

320656560 is a wasteful number, since it uses less digits than its factorization.

320656560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 320656560 is about 17906.8858264077. The cubic root of 320656560 is about 684.4578515236.

The spelling of 320656560 in words is "three hundred twenty million, six hundred fifty-six thousand, five hundred sixty".