320555428 has 24 divisors (see below), whose sum is σ = 566907264. Its totient is φ = 158589600.

The previous prime is 320555423. The next prime is 320555429. The reversal of 320555428 is 824555023.

It is a junction number, because it is equal to n+sod(n) for n = 320555393 and 320555402.

It is not an unprimeable number, because it can be changed into a prime (320555423) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 240901 + ... + 242227.

It is an arithmetic number, because the mean of its divisors is an integer number (23621136).

Almost surely, 2^320555428 is an apocalyptic number.

It is an amenable number.

320555428 is a deficient number, since it is larger than the sum of its proper divisors (246351836).

320555428 is a wasteful number, since it uses less digits than its factorization.

320555428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923 (or 1921 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

The square root of 320555428 is about 17904.0617737987. The cubic root of 320555428 is about 684.3858868128.

The spelling of 320555428 in words is "three hundred twenty million, five hundred fifty-five thousand, four hundred twenty-eight".