640805702 has 8 divisors (see below), whose sum is σ = 963379656. Its totient is φ = 319679152.

The previous prime is 640805677. The next prime is 640805719. The reversal of 640805702 is 207508046.

640805702 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360743 + ... + 362514.

It is an arithmetic number, because the mean of its divisors is an integer number (120422457).

Almost surely, 2^640805702 is an apocalyptic number.

640805702 is a deficient number, since it is larger than the sum of its proper divisors (322573954).

640805702 is a wasteful number, since it uses less digits than its factorization.

640805702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723702.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 640805702 is about 25314.1403567255. The cubic root of 640805702 is about 862.1353561022.

The spelling of 640805702 in words is "six hundred forty million, eight hundred five thousand, seven hundred two".