640320593 has 8 divisors (see below), whose sum is σ = 721065216. Its totient is φ = 563331600.

The previous prime is 640320587. The next prime is 640320641. The reversal of 640320593 is 395023046.

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 640320593 - 2¹⁴ = 640304209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640320503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 938546 + ... + 939227.

It is an arithmetic number, because the mean of its divisors is an integer number (90133152).

Almost surely, 2^640320593 is an apocalyptic number.

It is an amenable number.

640320593 is a deficient number, since it is larger than the sum of its proper divisors (80744623).

640320593 is a wasteful number, since it uses less digits than its factorization.

640320593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877815.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 640320593 is about 25304.5567635555. The cubic root of 640320593 is about 861.9177471343.

The spelling of 640320593 in words is "six hundred forty million, three hundred twenty thousand, five hundred ninety-three".