640303223 has 8 divisors (see below), whose sum is σ = 744178560. Its totient is φ = 539528760.

The previous prime is 640303207. The next prime is 640303253. The reversal of 640303223 is 322303046.

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 640303223 - 2⁴ = 640303207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640303253) 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, 774773 + ... + 775598.

It is an arithmetic number, because the mean of its divisors is an integer number (93022320).

Almost surely, 2^640303223 is an apocalyptic number.

640303223 is a deficient number, since it is larger than the sum of its proper divisors (103875337).

640303223 is a wasteful number, since it uses less digits than its factorization.

640303223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550437.

The product of its (nonzero) digits is 2592, while the sum is 23.

The square root of 640303223 is about 25304.2135424123. The cubic root of 640303223 is about 861.9099533058.

Adding to 640303223 its reverse (322303046), we get a palindrome (962606269).

The spelling of 640303223 in words is "six hundred forty million, three hundred three thousand, two hundred twenty-three".