640510 has 24 divisors (see below), whose sum is σ = 1251720. Its totient is φ = 235872.

The previous prime is 640499. The next prime is 640529. The reversal of 640510 is 15046.

It is a congruent number.

It is an unprimeable number.

640510 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 11 ways as a sum of consecutive naturals, for example, 1501 + ... + 1879.

It is an arithmetic number, because the mean of its divisors is an integer number (52155).

2⁶⁴⁰⁵¹⁰ is an apocalyptic number.

640510 is a deficient number, since it is larger than the sum of its proper divisors (611210).

640510 is a wasteful number, since it uses less digits than its factorization.

640510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 640510 is about 800.3186865243. The cubic root of 640510 is about 86.2002723922.

Adding to 640510 its reverse (15046), we get a palindrome (655556).

The spelling of 640510 in words is "six hundred forty thousand, five hundred ten".