640799014 has 4 divisors (see below), whose sum is σ = 961198524. Its totient is φ = 320399506.

The previous prime is 640799009. The next prime is 640799077. The reversal of 640799014 is 410997046.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable 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 as a sum of consecutive naturals, namely, 160199752 + ... + 160199755.

It is an arithmetic number, because the mean of its divisors is an integer number (240299631).

Almost surely, 2^640799014 is an apocalyptic number.

640799014 is a deficient number, since it is larger than the sum of its proper divisors (320399510).

640799014 is a wasteful number, since it uses less digits than its factorization.

640799014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320399509.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 640799014 is about 25314.0082562995. The cubic root of 640799014 is about 862.1323567628.

The spelling of 640799014 in words is "six hundred forty million, seven hundred ninety-nine thousand, fourteen".