320307657 has 8 divisors (see below), whose sum is σ = 428176320. Its totient is φ = 212988720.

The previous prime is 320307641. The next prime is 320307661. The reversal of 320307657 is 756703023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 320307657 - 2⁴ = 320307641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320307257) 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, 136069 + ... + 138402.

It is an arithmetic number, because the mean of its divisors is an integer number (53522040).

Almost surely, 2^320307657 is an apocalyptic number.

It is an amenable number.

320307657 is a deficient number, since it is larger than the sum of its proper divisors (107868663).

320307657 is a wasteful number, since it uses less digits than its factorization.

320307657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274863.

The product of its (nonzero) digits is 26460, while the sum is 33.

The square root of 320307657 is about 17897.1410286671. The cubic root of 320307657 is about 684.2095109881.

The spelling of 320307657 in words is "three hundred twenty million, three hundred seven thousand, six hundred fifty-seven".