640315613 has 8 divisors (see below), whose sum is σ = 744192960. Its totient is φ = 539539200.

The previous prime is 640315603. The next prime is 640315649. The reversal of 640315613 is 316513046.

It is a happy number.

640315613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 640315613 - 2⁶ = 640315549 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640315603) 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, 774788 + ... + 775613.

It is an arithmetic number, because the mean of its divisors is an integer number (93024120).

Almost surely, 2^640315613 is an apocalyptic number.

It is an amenable number.

640315613 is a deficient number, since it is larger than the sum of its proper divisors (103877347).

640315613 is a wasteful number, since it uses less digits than its factorization.

640315613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550467.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 640315613 is about 25304.4583621148. The cubic root of 640315613 is about 861.9155126486.

Adding to 640315613 its reverse (316513046), we get a palindrome (956828659).

The spelling of 640315613 in words is "six hundred forty million, three hundred fifteen thousand, six hundred thirteen".