320728552 has 8 divisors (see below), whose sum is σ = 601366050. Its totient is φ = 160364272.

The previous prime is 320728501. The next prime is 320728559. The reversal of 320728552 is 255827023.

It can be written as a sum of positive squares in only one way, i.e., 277089316 + 43639236 = 16646^2 + 6606^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (320728559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20045527 + ... + 20045542.

Almost surely, 2^320728552 is an apocalyptic number.

It is an amenable number.

320728552 is a deficient number, since it is larger than the sum of its proper divisors (280637498).

320728552 is a wasteful number, since it uses less digits than its factorization.

320728552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40091075 (or 40091071 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 320728552 is about 17908.8958900319. The cubic root of 320728552 is about 684.5090712278.

The spelling of 320728552 in words is "three hundred twenty million, seven hundred twenty-eight thousand, five hundred fifty-two".