320543764840 has 128 divisors (see below), whose sum is σ = 786769925760. Its totient is φ = 116828457984.

The previous prime is 320543764831. The next prime is 320543764883. The reversal of 320543764840 is 48467345023.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15735942 + ... + 15756298.

It is an arithmetic number, because the mean of its divisors is an integer number (6146640045).

Almost surely, 2^320543764840 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 320543764840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393384962880).

320543764840 is an abundant number, since it is smaller than the sum of its proper divisors (466226160920).

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

320543764840 is a wasteful number, since it uses less digits than its factorization.

320543764840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20771 (or 20767 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 46.

The spelling of 320543764840 in words is "three hundred twenty billion, five hundred forty-three million, seven hundred sixty-four thousand, eight hundred forty".