640893313 has 8 divisors (see below), whose sum is σ = 675299520. Its totient is φ = 606554640.

The previous prime is 640893289. The next prime is 640893329. The reversal of 640893313 is 313398046.

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 640893313 - 2²⁵ = 607338881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640896313) 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, 3231 + ... + 35947.

It is an arithmetic number, because the mean of its divisors is an integer number (84412440).

Almost surely, 2^640893313 is an apocalyptic number.

It is an amenable number.

640893313 is a deficient number, since it is larger than the sum of its proper divisors (34406207).

640893313 is a wasteful number, since it uses less digits than its factorization.

640893313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33767.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 640893313 is about 25315.8707730941. The cubic root of 640893313 is about 862.1746447136.

The spelling of 640893313 in words is "six hundred forty million, eight hundred ninety-three thousand, three hundred thirteen".