320128064 has 14 divisors (see below), whose sum is σ = 635254254. Its totient is φ = 160064000.

The previous prime is 320128063. The next prime is 320128073. The reversal of 320128064 is 460821023.

It can be written as a sum of positive squares in only one way, i.e., 256000000 + 64128064 = 16000^2 + 8008^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320128063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500937 + ... + 2501064.

Almost surely, 2^320128064 is an apocalyptic number.

It is an amenable number.

320128064 is a deficient number, since it is larger than the sum of its proper divisors (315126190).

320128064 is an equidigital number, since it uses as much as digits as its factorization.

320128064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5002013 (or 5002003 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 320128064 is about 17892.1229595596. The cubic root of 320128064 is about 684.0816108179.

Adding to 320128064 its reverse (460821023), we get a palindrome (780949087).

The spelling of 320128064 in words is "three hundred twenty million, one hundred twenty-eight thousand, sixty-four".