640707170 has 32 divisors (see below), whose sum is σ = 1246795200. Its totient is φ = 236229696.

The previous prime is 640707161. The next prime is 640707191. The reversal of 640707170 is 71707046.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38540 + ... + 52599.

It is an arithmetic number, because the mean of its divisors is an integer number (38962350).

Almost surely, 2^640707170 is an apocalyptic number.

640707170 is a deficient number, since it is larger than the sum of its proper divisors (606088030).

640707170 is a wasteful number, since it uses less digits than its factorization.

640707170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91202.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 640707170 is about 25312.1940969170. The cubic root of 640707170 is about 862.0911657571.

The spelling of 640707170 in words is "six hundred forty million, seven hundred seven thousand, one hundred seventy".