640260616 has 16 divisors (see below), whose sum is σ = 1201593600. Its totient is φ = 319835664.

The previous prime is 640260611. The next prime is 640260641. The reversal of 640260616 is 616062046.

It is not an unprimeable number, because it can be changed into a prime (640260611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27456 + ... + 45103.

It is an arithmetic number, because the mean of its divisors is an integer number (75099600).

Almost surely, 2^640260616 is an apocalyptic number.

It is an amenable number.

640260616 is a deficient number, since it is larger than the sum of its proper divisors (561332984).

640260616 is a wasteful number, since it uses less digits than its factorization.

640260616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73668 (or 73664 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 640260616 is about 25303.3716330453. The cubic root of 640260616 is about 861.8908351699.

The spelling of 640260616 in words is "six hundred forty million, two hundred sixty thousand, six hundred sixteen".