320828687 has 2 divisors, whose sum is σ = 320828688. Its totient is φ = 320828686.

The previous prime is 320828647. The next prime is 320828749. The reversal of 320828687 is 786828023.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320828687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320828647) 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, 160414343 + 160414344.

It is an arithmetic number, because the mean of its divisors is an integer number (160414344).

Almost surely, 2^320828687 is an apocalyptic number.

320828687 is a deficient number, since it is larger than the sum of its proper divisors (1).

320828687 is an equidigital number, since it uses as much as digits as its factorization.

320828687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 320828687 is about 17911.6913495069. The cubic root of 320828687 is about 684.5803009155.

The spelling of 320828687 in words is "three hundred twenty million, eight hundred twenty-eight thousand, six hundred eighty-seven".