320157128 has 16 divisors (see below), whose sum is σ = 610470000. Its totient is φ = 157365136.

The previous prime is 320157127. The next prime is 320157139. The reversal of 320157128 is 821751023.

It is a self number, because there is not a number n which added to its sum of digits gives 320157128.

It is not an unprimeable number, because it can be changed into a prime (320157127) 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 3 ways as a sum of consecutive naturals, for example, 338678 + ... + 339621.

It is an arithmetic number, because the mean of its divisors is an integer number (38154375).

Almost surely, 2^320157128 is an apocalyptic number.

It is an amenable number.

320157128 is a deficient number, since it is larger than the sum of its proper divisors (290312872).

320157128 is a wasteful number, since it uses less digits than its factorization.

320157128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678364 (or 678360 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 320157128 is about 17892.9351421168. The cubic root of 320157128 is about 684.1023124771.

The spelling of 320157128 in words is "three hundred twenty million, one hundred fifty-seven thousand, one hundred twenty-eight".