320564387 has 8 divisors (see below), whose sum is σ = 376607280. Its totient is φ = 269004960.

The previous prime is 320564369. The next prime is 320564407. The reversal of 320564387 is 783465023.

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

It is a cyclic number.

It is not a de Polignac number, because 320564387 - 2⁸ = 320564131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320564387.

It is not an unprimeable number, because it can be changed into a prime (320564687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1120712 + ... + 1120997.

It is an arithmetic number, because the mean of its divisors is an integer number (47075910).

Almost surely, 2^320564387 is an apocalyptic number.

320564387 is a deficient number, since it is larger than the sum of its proper divisors (56042893).

320564387 is a wasteful number, since it uses less digits than its factorization.

320564387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241733.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 320564387 is about 17904.3119666744. The cubic root of 320564387 is about 684.3922625755.

The spelling of 320564387 in words is "three hundred twenty million, five hundred sixty-four thousand, three hundred eighty-seven".