320745128 has 16 divisors (see below), whose sum is σ = 656069760. Its totient is φ = 145793200.

The previous prime is 320745121. The next prime is 320745149. The reversal of 320745128 is 821547023.

It is a junction number, because it is equal to n+sod(n) for n = 320745094 and 320745103.

It is not an unprimeable number, because it can be changed into a prime (320745121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1822328 + ... + 1822503.

It is an arithmetic number, because the mean of its divisors is an integer number (41004360).

Almost surely, 2^320745128 is an apocalyptic number.

It is an amenable number.

320745128 is an abundant number, since it is smaller than the sum of its proper divisors (335324632).

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

320745128 is a wasteful number, since it uses less digits than its factorization.

320745128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3644848 (or 3644844 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 320745128 is about 17909.3586708179. The cubic root of 320745128 is about 684.5208633667.

The spelling of 320745128 in words is "three hundred twenty million, seven hundred forty-five thousand, one hundred twenty-eight".