640516 has 12 divisors (see below), whose sum is σ = 1145088. Its totient is φ = 313352.

The previous prime is 640499. The next prime is 640529. The reversal of 640516 is 615046.

640516 is nontrivially palindromic in base 5.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516 + ... + 1891.

It is an arithmetic number, because the mean of its divisors is an integer number (95424).

2⁶⁴⁰⁵¹⁶ is an apocalyptic number.

It is an amenable number.

640516 is a deficient number, since it is larger than the sum of its proper divisors (504572).

640516 is a wasteful number, since it uses less digits than its factorization.

640516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3458 (or 3456 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 640516 is about 800.3224350223. The cubic root of 640516 is about 86.2005415527.

It can be divided in two parts, 640 and 516, that added together give a square (1156 = 34²).

The spelling of 640516 in words is "six hundred forty thousand, five hundred sixteen".