640346510 has 16 divisors (see below), whose sum is σ = 1168414416. Its totient is φ = 252629568.

The previous prime is 640346503. The next prime is 640346527. The reversal of 640346510 is 15643046.

It is a happy number.

640346510 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437864 + ... + 439323.

It is an arithmetic number, because the mean of its divisors is an integer number (73025901).

Almost surely, 2^640346510 is an apocalyptic number.

640346510 is a deficient number, since it is larger than the sum of its proper divisors (528067906).

640346510 is a wasteful number, since it uses less digits than its factorization.

640346510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877267.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 640346510 is about 25305.0688598154. The cubic root of 640346510 is about 861.9293756951.

Adding to 640346510 its reverse (15643046), we get a palindrome (655989556).

The spelling of 640346510 in words is "six hundred forty million, three hundred forty-six thousand, five hundred ten".