640349270 has 16 divisors (see below), whose sum is σ = 1257413328. Its totient is φ = 232854240.

The previous prime is 640349257. The next prime is 640349287. The reversal of 640349270 is 72943046.

640349270 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 640349270.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2910569 + ... + 2910788.

It is an arithmetic number, because the mean of its divisors is an integer number (78588333).

Almost surely, 2^640349270 is an apocalyptic number.

640349270 is a deficient number, since it is larger than the sum of its proper divisors (617064058).

640349270 is a wasteful number, since it uses less digits than its factorization.

640349270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5821375.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 640349270 is about 25305.1233942852. The cubic root of 640349270 is about 861.9306140463.

The spelling of 640349270 in words is "six hundred forty million, three hundred forty-nine thousand, two hundred seventy".